Yes, you can put a smart thermostat on a heat pump, and the best smart thermostats for heat pumps are the ones that let you control two things most models skip: the outdoor temperature at which your backup auxiliary heat engages, and the staging differentials your compressor runs on. Our pick for the best smart thermostat for heat pumps overall is the Sensi Smart Thermostat ST55. It is rated for heat pumps, it rarely needs a C-wire, it installs in about 15 minutes, and it holds a 4.4 rating across more than 23000 reviews.
That direct answer only holds for one kind of system though, and two questions decide everything else. First: is your backup heat electric strip heat, or is it a gas furnace? An air-source heat pump with electric auxiliary heat behaves completely differently from a dual-fuel heat pump and gas furnace, and the second needs load balancing rather than a simple lockout. Second: does your wall have a C-wire? A good share of older homes do not, and that single fact rules out several picks below.
We put twelve smart thermostats through a heat pump lens rather than a general smart home one. That meant ranking staging support, auxiliary heat control, C-wire behavior, humidity handling and wiring depth ahead of screen size and voice assistants. We verified the product details against manufacturer listings and current owner reviews, with everything checked in September.
The short version of what matters: a heat pump moves roughly two and a half to four times as much heat per unit of electricity as electric resistance backup heat does. A thermostat that lets the strip heat start at a mild outdoor temperature does not just cost you money, it quietly shortens the compressor run time you paid for. Getting the lockout right is the single highest-value thing you can do with this purchase.
Before you buy anything, though, it helps to know what a heat pump thermostat actually has to do. Our humidifier picks for nurseries cover the moisture side of indoor comfort, and the wiring details below cover everything else.
Table of Contents
Top 3 Smart Thermostats for Heat Pumps in September 2026
Sensi Smart Thermostat ST55
- Rated for heat pumps and furnaces
- No C-wire needed in most applications
- 24V system
- 3 year warranty
Sensi Touch ST75
- Highest rating in the group at 4.5
- LCD color touchscreen
- Works with heat pumps and two-stage furnaces
- 3 year warranty
ecobee Smart Thermostat…
- Compatible with 95% of HVAC systems
- SmartSensor included
- Power Extender Kit in the box
- 3 year manufacturer warranty
All 12 Smart Thermostats for Heat Pumps Compared in September 2026
Every model below is a real 24V low-voltage thermostat. The differences that matter for a heat pump are staging support, whether the unit can hold off auxiliary heat, and how it behaves when a C-wire is missing.
| Product | Specs | Action |
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| Sensi Smart Thermostat ST55 |
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 Amazon Smart Thermostat |
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 Honeywell Home Smart Color RTH9600WF |
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 Google Nest Thermostat |
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| Sensi Touch ST75 |
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| ecobee Smart Thermostat Premium |
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 ecobee Smart Thermostat Enhanced |
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 Honeywell Lyric T6 Pro Wi-Fi |
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 Google Nest Learning Thermostat 4th gen |
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 Sensi Lite ST25 |
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 ecobee Smart Thermostat Essential |
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 Honeywell Vision Pro 8000 |
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1. Sensi Smart Thermostat ST55 – Best Smart Thermostat for Heat Pumps Overall
Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55
2.4 GHz Wi-Fi
Temperature accuracy within 1 degree F
24V system control
3 year warranty
Pros
- Guided DIY install with most owners finishing in 10-20 minutes
- Rated for heat pumps furnaces boilers and AC
- No C-wire needed in most applications
- Works with Alexa HomeKit Google Assistant and SmartThings
- Humidity and system status shown on the unit and in the app
Cons
- High low temperature and humidity alert thresholds cannot be adjusted
- Wi-Fi pairing can be awkward on dual-band or smart-mode routers
- Backlight does not stay lit continuously
The Sensi ST55 is the unit we keep coming back to for heat pump homes, and the reason is boring in the best way. It is listed for heat pumps, furnaces, boilers and air conditioning, so it will not fight your equipment during setup. The app walks you through the wiring with a built-in level and named wires, and owners consistently report finishing the swap in 10 to 20 minutes.
It also lists no C-wire requirement for most applications, which is a bigger deal than it sounds. A C-wire is the single most common reason a heat pump owner gives up on a smart thermostat, and this one sidesteps it in the majority of older homes.
On the technical side it runs on 24V AC, reads temperature to within 1 degree F, and works over 2.4 GHz Wi-Fi. It is ENERGY STAR certified with a manufacturer estimate of about 23% savings on HVAC energy, and it sends filter replacement reminders and equipment alerts to the app. Two AA batteries are included as a backup for the display.
Owners who moved from a basic dial thermostat report a real comfort change, mostly because the app makes per-day scheduling easy rather than because the schedule is clever. The unit fits the footprint of a conventional thermostat, so you are not left with a hole in the wall.
Will this work on your two-stage or three-stage heat pump
The manufacturer does not publish a stage count for the ST55, so for a multi-stage compressor this is a configuration-by-installation decision rather than a plug-and-play one. One owner on a multistage wiring question confirmed the thermostat is capable of handling a heat pump and both stages given the wiring shown.
If your system has a W2 or Y2 terminal, plan on setting staging through the installer menus during setup rather than expecting an app toggle. That is exactly the scenario where the more explicitly staged Honeywell units below are the safer read.
What it will not do for you
There is no remote room sensor, no occupancy radar and no air quality monitor on this model, which is why the ecobee units cost more. The high and low alert thresholds for temperature and humidity are fixed rather than adjustable, a real limitation if you are watching a rental property from another state.
Wi-Fi pairing stumbles on some routers that run a single smart-mode SSID or a guest network. If your network is set up that way, join the 2.4 GHz band before starting the setup.
2. Amazon Smart Thermostat – Best for Alexa-Native Homes
Amazon Smart Thermostat, Save money and energy, Works with Alexa and Ring, C-wire required
C-wire required
Based on Honeywell Home thermostat technology
ENERGY STAR certified
Alexa and Ring compatible
Pros
- Low entry cost for a connected thermostat
- Built on Honeywell Home thermostat hardware
- Alexa app guides the installation step by step
- Home away and sleep schedules supported
- Energy rebate finder email after purchase
Cons
- C-wire required with no adapter path on heating-only systems
- No local humidity or detailed system diagnostics on the unit
- Limited standalone scheduling since most control happens through Alexa
- Highest share of one-star reviews in this group
The Amazon Smart Thermostat is built on Honeywell Home thermostat hardware, which is a meaningful advantage for a heat pump buyer. The control logic underneath is the same family technicians trust, and the listing explicitly notes that heat pumps require a C-wire.
That C-wire requirement is the deciding factor. If your system already has one, installation is a straightforward swap and the Alexa app walks you through it. If it does not, this is the wrong pick in a heat pump house.
Comfort zones are the feature worth knowing about. Using select Alexa devices with temperature or presence detection, the thermostat can shift your setpoint when people arrive or leave, which is a reasonable way to cut auxiliary heat use in a home that empties during the day.
It is ENERGY STAR certified with an EPA estimate of annual energy bill savings, and it sends an energy rebate finder email after purchase. The review base is enormous, which cuts both ways: there is a lot of feedback and also the largest proportion of one-star reviews in this roundup, largely around install friction and reliability.
Whether the C-wire requirement is a dealbreaker
For a heat pump, a missing C-wire is a real cost, not an inconvenience. You are looking at a power adapter or a new low-voltage transformer run, and on a gas backup system that sometimes means opening a wall. Check the terminals behind your existing thermostat before you commit to this one.
If you already have the wire, none of this applies and you are looking at the cheapest genuinely connected option that still runs on proven hardware.
How much control you actually get
Most day-to-day control happens inside Alexa rather than in a dedicated scheduling app, so if you are not running an Echo-based household you will find the standalone experience thinner than the product list suggests. There is no humidity display and no system diagnostics on the unit itself.
Reviewers also point out that scheduling outside the three built-in modes is limited. If you want per-day setback blocks, a Sensi or ecobee app gives you far more room.
3. Honeywell Home Smart Color RTH9600WF – Best for a Large Color Screen
Honeywell Home RTH9600WF Smart Color Thermostat ENERGY STAR Wi-Fi Programmable Touchscreen Alexa Ready – C-Wire Required
4.75 inch wide color LCD
On-screen humidity and daily forecast
Rated for heat pumps with electric backup
2 year limited warranty
Pros
- Customizable high-definition color display
- Explicitly rated for heat pumps with electric backup
- On-screen indoor and outdoor temperature plus humidity and forecast
- ENERGY STAR certified with a rebate finder
- Works with Alexa Google Assistant Microsoft Cortana and IFTTT
Cons
- C-wire required and a power adapter is needed on older systems
- Not compatible with 120-240V electric baseboard heat
- Older Wi-Fi models in this family have been reported to lose their Wi-Fi circuit after power flickers
- Mobile app interface feels dated next to ecobee and Nest
This is the Honeywell unit to buy if you want a thermostat you can read from across a room. The customizable high-definition color screen shows indoor and outdoor temperature, humidity and a daily forecast, and it is one of the few picks here whose listing explicitly names heat pumps with electric backup as a supported use.
Honeywell’s Smart Response technology adjusts the schedule based on how long the house actually takes to recover, which matters more on a heat pump than on a gas furnace because the compressor is slower to reheat a cold home. Energy usage tracking and personalized savings tips come through the app.
The voice support list is unusually long: Amazon Alexa, Google Assistant, Microsoft Cortana and IFTTT all work alongside the app. A C-wire power adapter is available separately if your system lacks one, which is the standard retrofit path.
Owners like the build and the on-screen comfort data. The recurring complaints are about software rather than hardware, with the app described as dated compared with ecobee and Nest, and some owners of earlier Wi-Fi models in this family reporting a lost wireless circuit after power flickers.
Where this unit fits on a heat pump system
It is rated for heat pumps with electric backup, so an air-source system with strip heat is squarely in range. It will not drive 120-240V electric baseboard heat, so a hybrid baseboard-and-heat-pump house is out of scope for this model.
On staging, treat this as a 2-stage class unit and confirm with your installer that the second stage will be wired and configured. The screen is the selling point; the staging menu is not documented for us to verify.
What to check before you buy
Confirm a C-wire is present, or budget for the power adapter. A single AAA battery is included, but the listing is explicit that the C-wire carries the real power.
If you care more about the app than the display, the Sensi options give you a cleaner scheduling experience for less. This one is the hardware choice.
4. Google Nest Thermostat – Best for Minimalist Design and Learning
Google Nest Thermostat – Smart Thermostat for Home – Programmable Wifi Thermostat – Charcoal
2 inch LCD display
4.96 ounces
2.4 GHz and 5 GHz Wi-Fi with Bluetooth
1 year warranty
Pros
- Minimalist design that blends into a modern interior
- Schedule and occupancy are learned automatically
- Away mode combines phone location with the built-in motion sensor
- Savings Finder suggests schedule tweaks with monthly energy history
- Works with Google Home and Matter devices
Cons
- C-wire or power accessory required for some heat pump and zone-controlled systems
- On-box instructions are sparse and setup leans on the app
- Swipe temperature control is unintuitive for older users
- Limited offline operation when the internet drops
The base Nest Thermostat is the most talked-about unit on heat pump forums, largely because HVAC technicians push back on it. The criticism is not about the hardware. It is about control granularity, and it is worth understanding before you buy.
The Nest learns your routine rather than asking you to build a schedule, and its Away mode uses your phone location plus a built-in motion sensor. For a household with a predictable weekday pattern that works well. The thermostat is also listed for heat pumps as a specific use.
Connectivity is dual band, supporting 2.4 GHz and 5 GHz Wi-Fi plus Bluetooth Low Energy for wireless interconnect, which makes it one of the easier units to pair on a modern mixed network. It works with Google Assistant, Alexa, Apple HomeKit and SmartThings.
The 4.1 rating across roughly 29600 reviews is the lowest here, and the complaints cluster around documentation and app dependence rather than comfort. Setup instructions on the box are thin, and a device that shows offline may need to be pulled off the wall and re-added from scratch.
The C-wire truth for heat pump owners
Google markets this as working without a C-wire in most homes, and that is true for a standard combined system. The same technical details state that a C-wire or power accessory is required for heating-only, cooling-only, zone-controlled and heat pump systems.
That last clause catches a lot of people. If you are on a heat pump, do not assume you can skip the power accessory. Check the terminals first.
What the HVAC trade is actually objecting to
The recurring forum objection is that the Nest does not give an installer the same fine control over staging and lockout that a technician wants when tuning a heat pump to a specific house. On a gas furnace it is a non-issue. On a multi-stage heat pump in a cold climate, the granularity you give up is exactly what determines how much strip heat you run.
The second objection is recovery behavior. A heat pump reheats a cold house slowly, and aggressive learning setbacks can leave you waking up to a house that is still catching up.
5. Sensi Touch ST75 – Top Rated, Best for Reliability
Sensi Touch Smart Thermostat by Emerson with Touchscreen Color Display, Programmable, Wi-Fi, Mobile App, Easy DIY, Data Privacy, Works with Alexa, Energy Star Certified, ST75 – Black, C-Wire Required
4.3 inch color touchscreen
13.6 ounces
24V AC powered with no battery fallback
3 year warranty
Pros
- Highest average rating in the group at 4.5
- Large bright color touchscreen with adjustable night brightness
- App-guided wiring with a built-in level and wire ID stickers
- Display background color changes to show heating or cooling calls
- Stable Wi-Fi and app performance reported by long-term owners
- Works with heat pumps two-stage furnaces and whole-house humidifiers
Cons
- C-wire required for all functions with no battery backup
- 2.4 GHz only so some router configuration is needed
- Setup can be difficult on single smart-mode SSID or guest networks
- Smart features are locked to US and Canada registration
The Sensi Touch holds the highest average rating in this roundup at 4.5, across more than 14000 reviews, and owners describe it as the most reliable unit they have installed. That reliability matters more on a heat pump than the spec sheet suggests, because a thermostat that keeps dropping off the network means your schedule stops running and your backup heat policy stops applying.
It is listed for air conditioners, boilers, furnaces and heat pumps, and long-term owners specifically call out heat pumps and two-stage furnaces as working well. A whole-house humidifier can be controlled from the same wall unit, which is a bonus if your indoor humidity problem is seasonal.
The display background changes color to show a heating or cooling call, so you can tell at a glance whether the thermostat is asking the system for heat. The screen is bright and readable from across a room, with adjustable night brightness and a touchscreen lock to stop accidental changes.
Installation hardware is unusually good. There is a built-in level on the mounting plate, illuminated easy-click terminals and app wiring instructions, plus geofencing, auto changeover, a filter indicator and daylight savings readiness. It is ENERGY STAR certified with the same about 23% savings estimate as the rest of the Sensi line.
Plan your C-wire before you order
This is the one hard rule with the ST75. It needs a C-wire for all functions and has no battery fallback, so if your home lacks one you need a 24V AC transformer of at least 300 mA arranged before you remove the old thermostat. That is the difference between a 20 minute swap and a service call.
Once the power is in place, installation is genuinely quick. The app plus the built-in level does most of the work.
Where it is the wrong pick
Wi-Fi is 2.4 GHz only, so a router that merges bands under one smart-mode SSID will need reconfiguring before pairing. Smart features are also tied to US and Canada registration, which rules the unit out outside North America.
For a dual-fuel system where you need load balancing with delay thresholds, this is not the right tool. That is a job for a staging-focused Honeywell unit.
6. ecobee Smart Thermostat Premium – Best for Room-by-Room Comfort
ecobee Smart Thermostat Premium – WiFi, Siri & Alexa Built-In, Smart Sensor
Compatible with 95% of HVAC systems
Power Extender Kit included
SmartSensor included
3 year manufacturer warranty
Pros
- Highest HVAC compatibility here at 95% with broad heat pump support
- Included SmartSensor solves hot and cold spots room by room
- Built-in radar occupancy sensor preheats and precools
- Air quality monitoring with filter change reminders
- Power Extender Kit included for homes without a C-wire
Cons
- Most expensive option in this roundup
- Siri voice control requires an Apple home hub
- Smart security features require a subscription
- Front-door camera features need an ecobee Smart Doorbell Camera
The ecobee Premium is the pick if your heat pump home has uneven temperatures, which is the default in a two-story house or one with a hallway thermostat location. It includes a SmartSensor in the box, so you can move the control point to the room you actually live in without a second purchase.
Compatibility is listed at 95% of HVAC systems, and the specific uses line names air conditioners, boilers, dehumidifiers, electric baseboard heaters, furnaces, heat pumps and humidifiers. Long-term users on the Home Assistant community describe it as easy to define range limits, and the phone app closely mirrors the thermostat itself.
The box includes a Power Extender Kit and a trim kit, so a C-wire-free installation is covered. Built-in radar occupancy sensing preheats and precools before you arrive rather than after, which reduces the compressor’s short cycling at the start of a cycle. A built-in air quality monitor triggers filter reminders, and there is a built-in smart speaker with Alexa or Siri.
Manufacturer savings claim is up to 26% on energy bills versus holding 72 degrees. Treat that as a ceiling rather than a promise. The honest version is that the savings come from schedule and sensor behavior, not from the thermostat generating heat.
Whether the price difference pays for itself
It does if you have a room that is genuinely uncomfortable, because the included sensor is the one accessory every other pick on this list makes you buy separately. It does not if your home holds temperature evenly and you mainly want a good schedule.
The ongoing cost is worth noting too. Siri control needs an Apple home hub, and the smart security features sit behind a subscription. A separate Smart Doorbell Camera is needed for the front-door video and two-way talk.
What heat pump owners get from it
Radar occupancy sensing is genuinely useful here. Because the heat pump takes longer to recover than a gas furnace, starting the cycle before you arrive means you reach temperature without a long stretch of auxiliary heat assist afterward.
Long-term ecobee owners point to range limits as the feature they would not give up, and that is the same concept as an auxiliary heat policy expressed in the app.
7. ecobee Smart Thermostat Enhanced – Best for eco+ Automation
ecobee Smart Thermostat Enhanced, Programmable Wifi Thermostat
Compatible with 90% of HVAC systems
Power Extender Kit included
4 inch display
3 year manufacturer warranty
Pros
- Strong 4.4 rating with built-in occupancy sensing and learning
- Compatible with 90% of HVAC systems including heat pumps
- Power Extender Kit included so it installs without a C-wire
- eco+ tunes comfort against local weather utility rates and grid activity
- Remote control from phone tablet or Apple Watch
Cons
- SmartSensors for room-by-room comfort are sold separately
- Costs meaningfully more than the Sensi and Honeywell units here
- No built-in air quality monitor or smart speaker unlike the ecobee Premium
The Enhanced model is the middle of the ecobee line and, for many heat pump owners, the smarter buy than the Premium. It keeps the two things that matter most for a heat pump home, a 90% system compatibility rating including heat pumps and a bundled Power Extender Kit, and drops the accessories most people never touch.
Built-in occupancy sensing handles preheat and precool, and eco+ uses your routine, local weather and grid activity to shift the schedule. On a system where every hour of compressor run is cheaper than an hour of strip heat, that automation is doing real work.
It works with Alexa, Google Assistant, Apple HomeKit and SmartThings, and you control it from a phone, tablet or Apple Watch. Manufacturer savings claim is up to 26% per year on heating and cooling costs.
The 4.4 rating sits comfortably alongside the Sensi units. The trade-offs are all about removals rather than failures: no air quality monitor, no built-in speaker, and room sensors are an add-on purchase rather than a bundled one.
Premium or Enhanced for a heat pump home
Choose Enhanced if your home heats evenly. You keep occupancy sensing, the C-wire-free install and the same 24V compatibility class, and you give up the included SmartSensor. If you already know one room is always cold, the Premium bundles the fix.
Compatibility at 90% versus 85% on the entry model is worth a look if your wiring is unusual, because heat pumps with a humidifier or a dehumidifier on the same line widen the equipment mix.
What it will not manage
There is no outdoor lockout or staging menu we can verify for this model, so on a multi-stage compressor you are still relying on installer configuration. The eco+ features tune schedule behavior rather than dictating when backup heat may run.
That is the honest limitation: the app is excellent at when you want heat, and thin on how the equipment stages once you ask.
8. Honeywell Lyric T6 Pro Wi-Fi – Best for Two-Stage Heat Pumps
Honeywell TH6220WF2006/U Lyric T6 Pro Wi-Fi Programmable Thermostat with Stages Up to 2 Heat/1 Cool Heat Pump or 2 Heat/2 Cool Conventional
Supports up to 2 heat and 1 cool staging on heat pumps
No separate Wi-Fi gateway needed
App and web portal control
4 ounces
Pros
- Specifically built for heat pump systems up to 2 heat and 1 cool
- Works without a separate Wi-Fi gateway
- Well regarded by HVAC professionals for reliability
- App and web-based remote control
- Good value for the staging capability offered
Cons
- Dated non-color LCD compared with newer units
- Setup menus require HVAC terminology knowledge
- Fewer smart features than ecobee or Nest with no sensors learning or air quality
The Lyric T6 Pro is the most explicitly heat-pump-oriented thermostat in this roundup, because the product itself is specified in terms of stages. It supports up to 2 heat and 1 cool on a heat pump system, and up to 2 heat and 2 cool on a conventional one.
That statement matters. A thermostat that cannot address the second stage of a two-stage compressor is effectively running a multi-stage system as a single-stage unit, which is exactly the mismatch owners complain about on HVAC forums. This one is designed around the problem.
It uses the Honeywell app and web portal directly with no separate gateway, which keeps installation simpler and removes another box from the wall. Remote temperature sensing options are supported. It takes two AA batteries and measures 4 ounces, so it is a light, unobtrusive unit.
The 4.4 rating here reflects a technician audience. On hvac-talk.com, HVAC professionals repeatedly single out the T6 Pro Wi-Fi line as among the best on the market because of the settings available.
Staging versus smart features
This is a staging tool that happens to be connected, not a lifestyle device. There is no room sensor, no learning algorithm and no air quality monitoring. If your priority is equipment control, that is exactly the right trade.
The setup menus assume you know terms like staging differential and lockout. For a homeowner that is a learning curve, and for anyone who is comfortable with HVAC vocabulary it is a feature.
Who should skip it
If you want a color screen, occupancy sensing or per-day scheduling in a polished app, the Sensi and ecobee units deliver more. The T6 Pro answers a narrower question and answers it well.
It is also the older design, with a non-color LCD and a plain 5 by 2.3 by 6 inch body, so treat it as the practical technician pick rather than the display pick.
9. Google Nest Learning Thermostat 4th Gen – Best for Learning Schedules
Google Nest Learning Thermostat (4th gen) + Nest Temperature Sensor (2nd gen) – Obsidian
Includes a Nest Temperature Sensor 2nd gen
Adjustable compressor maintenance band
Works with most 24V systems
Matter compatible
Pros
- Premium aluminum build with a large far-readable display
- Included temperature sensor prioritizes the room you actually use
- Learning schedule adapts within the first week
- Adaptive Eco uses outdoor temperature to pick a setback temperature
- Explicitly compatible with heat pump systems
Cons
- 4th gen base plate is incompatible with 3rd gen Nest mounts
- Some systems without a C-wire fail the setup app power check
- Not ENERGY STAR rated which can disqualify buyers from utility rebates
- Not usable outside the US market
The fourth generation Nest Learning Thermostat is a genuine step up from the base model, and the included Nest Temperature Sensor is the reason. It moves the control point to the room you choose, which fixes the hot bedroom and cold hallway problem that a hallway-mounted heat pump thermostat always creates.
It works with most 24V systems including gas, electric, oil, forced air, heat pump and radiant, and no C-wire is required in most homes. The display is 60% larger than the previous generation with Dynamic Farsight and automatic brightness.
The detail that matters most for a heat pump is the manual adjustment of the compressor maintenance band. That is the setting that controls how tight the compressor can be allowed to run before the thermostat decides it is not keeping up, and having it exposed is uncommon at this level.
Adaptive Eco uses the outdoor temperature to choose an energy-saving setback temperature rather than applying a fixed one. Manufacturer savings claim is up to 31% on heating and cooling bills. Sensor groups let you balance comfort across several rooms.
The C-wire catch worth knowing
Google says no C-wire is needed in most homes, but some systems without one fail the setup app power check even when power is present. On a heat pump, run the check before you commit rather than after the unit is on the wall.
Upgrading from a third generation Nest also means a new backplate, because the fourth generation base plate does not fit the older mounts.
The rebate catch most buyers miss
This model is not ENERGY STAR rated, which can disqualify you from utility rebate programs even when your system otherwise qualifies. That is a real out-of-pocket difference over a few years, and it is worth checking your utility’s list before ordering.
It is also US-only. Owners who want the learning behavior without the ecosystem lock-in usually end up on the Sensi line instead.
10. Sensi Lite ST25 – Budget Pick
Sensi Lite Smart Thermostat, WiFi, Alexa, DIY, Energy Star Certified, ST25
C-wire required for heat pump systems
2.4 GHz Wi-Fi
ENERGY STAR certified
3 year warranty
Pros
- Lowest cost Wi-Fi thermostat in this roundup
- Installs in 5-15 minutes with app and video walkthroughs
- Large high-contrast display readable from a distance
- Simple uncluttered app with 7-day scheduling and relative humidity
- Owners report qualifying for utility rebates
Cons
- Lowest average rating here at 4.0 with the largest share of one-star reviews
- Recurring reports of dropped Wi-Fi and losing the thermostat in the app
- Some units consume batteries faster than expected
- No color display unlike its larger Sensi siblings
The Sensi Lite is the cheapest connected thermostat here and the most interesting story in the reviews. Several owners bought it specifically after a Nest would not pair with their system, which tells you something about how tight compatibility checks have become on bigger brands.
It is listed for heat pumps along with air conditioners, boilers and furnaces, and it is ENERGY STAR certified with the same about 23% savings estimate. Installation guidance uses a built-in level, step-by-step instructions and video walkthroughs, and owners report finishing in 5 to 15 minutes.
There is a C-wire caveat that matters specifically for heat pumps. The technical details state that a C-wire is required for heat pump and heat or cool-only systems, while most other system types do not need one. So the unit is heat pump compatible, just not heat pump friendly in an older wiring setup.
The app is deliberately simple, with 7-day scheduling, geofencing and usage reports. The app background shifts grey, blue or red to match an off, cooling or heating call, and it can start heating gradually to reduce HVAC wear.
Is the Wi-Fi reliability concern real
It is the main reason for the 4.0 rating and the 16% share of one-star reviews. Recurring reports describe dropped connections and the thermostat disappearing from the app, which on a heat pump means your schedule can stop being enforced without you noticing.
Owners who keep it generally report it works fine, so this is a quality distribution issue rather than a broken product. If you cannot check the app daily, spend more elsewhere.
What you give up versus the ST55
You lose the button-and-dial feel, get no color display and accept a less capable feature set. What you keep is the Sensi app, the 2.4 GHz Wi-Fi, ENERGY STAR certification and a three year warranty, which is generous at this tier.
Some owners also report faster than expected battery drain and fragile battery contacts. Smart features are limited to the US and Canada.
11. ecobee Smart Thermostat Essential – Best Entry Into the ecobee Ecosystem
ecobee Smart Thermostat Essential – WiFi Thermostat, Energy Star Certified
Compatible with 85% of systems
3.74 inch display
Supports heat pump 2H/1C
ENERGY STAR certified
Pros
- ENERGY STAR certified with savings of up to 23% per year
- Supports heat pump systems at 2H and 1C
- eco+ time-of-use preheat and precool during cheaper energy periods
- Color touchscreen with free software upgrades
- Works with Alexa Google Assistant and Apple HomeKit
Cons
- Lowest system compatibility of the three ecobee models here at 85%
- Power Extender Kit and trim kit are sold separately
- No built-in occupancy sensor air quality monitor or smart speaker
- Smallest and plainest display of the ecobee range
The Essential is the way into the ecobee app ecosystem without paying for the Premium or Enhanced. It is ENERGY STAR certified with a savings estimate of up to 23% per year, and the technical details confirm it works with most 24 VAC equipment including heat pump systems at 2 heat and 1 cool.
That is the detail to check against your equipment. The broader compatibility claim covers gas, oil, electric, dual fuel, forced air, conventional 2H/1C or 1H/2C systems, boilers and heat pumps at 2H/1C. A three-stage compressor is outside the stated envelope.
eco+ adds indoor humidity detection, a schedule assistant and time-of-use preheat and precool, which means it can shift heating into cheaper rate windows. A SmartSensor add-on is supported and sold separately in two-packs if you later want room-level control.
The 3.74 inch color touchscreen gets free software upgrades, which is the underrated part: the unit improves after you buy it. It works with Alexa, Google Assistant and Apple HomeKit.
When 85% compatibility is a problem
On an unusual system, the gap between 85% and 90% compatibility is the gap between installing the unit yourself and calling a technician. Unusual means a humidifier or dehumidifier on the same control line, a boiler, or a dual-fuel arrangement with more going on than a standard 2H/1C heat pump.
For a straightforward two-stage heat pump the Essential is fine. For anything with extra equipment, the Enhanced model is the safer buy.
What you do not get
The Power Extender Kit and trim kit are sold separately here, unlike the Enhanced and Premium. So a C-wire-free install costs extra, and the box is just the thermostat, backplate, screws, drywall plugs and wire labels.
There is also no occupancy sensor, no air quality monitor and no built-in speaker. At 4.2 it is the lowest-rated ecobee here, which is reasonable for the entry model.
12. Honeywell Vision Pro 8000 – Best for Three-Stage Heat Pumps
Honeywell TH8321WF1001 Touchscreen Thermostat Wifi Vision Pro 8000 with Stages upto 3 Heat / 2 Cool
Supports up to 3 heat and 2 cool stages
Outdoor temperature sensor input for lockout
12.8 ounces
C-wire powered
Pros
- Widest staging support here at 3 heat and 2 cool for multi-stage heat pumps
- Built-in dehumidification and humidification control
- Program assist learns recovery time and pre-adjusts schedules
- Total Connect Comfort app and web portal with no separate gateway
- Email alerts when temperature or humidity leaves set thresholds
Cons
- C-wire required with no battery fallback so the unit is dead without furnace power
- Setup is question-heavy and effectively professional-only
- Only one remote sensor input so multiple wired sensors average together
- Dated pale blue backlight and interface next to modern color touchscreens
The Vision Pro 8000 is the only thermostat here that supports up to 3 stages of heat and 2 stages of cool. If your outdoor unit is a three-stage heat pump with electric or gas backup, this is the unit whose specification matches your equipment.
It also accepts an outdoor temperature sensor input specifically for heat pump lockout, which is the physical-sensor version of the auxiliary heat policy you are trying to control. That is a meaningfully different approach from an app-based lockout, and some installers prefer it because it does not depend on the thermostat’s own temperature source.
Program assist learns how long your home takes to heat and cool, then pre-adjusts the schedule around recovery time. That matters on a heat pump more than almost anything else, because a deep setback against a slow-reheating house is where auxiliary heat gets added unnecessarily. There is also humidifier and dehumidifier control, auto switchover, a fan cycle function and email alerts on temperature and humidity thresholds.
Control runs through the Total Connect Comfort app and web portal with no separate gateway. It is C-wire powered from the furnace transformer, which the listing is candid about, and professional installation is recommended.
Who this is genuinely for
Three-stage heat pump owners, dual-fuel systems with gas backup, and anyone whose installer wants to dial in staging differentials and lockout from a menu rather than an app. It is also the unit to consider if humidity control is part of the job, since dehumidification and humidification are built in.
It is the least DIY-friendly thermostat in this roundup by a wide margin. The setup is question-heavy with no auto-setup mode.
The limitations to weigh
Only one remote sensor input is available, so multiple wired sensors average together and need careful series or parallel wiring. There are no wireless room sensors. The C-wire is mandatory with no battery fallback, and the interface looks dated next to a color touchscreen.
In exchange, owners report units running 10 years or more and surviving power outages, which is the argument for this model in a finished mechanical room.
Heat Pump Thermostat Buying Guide
Most smart thermostat comparisons are written for gas furnaces, where the only question is whether the unit stages. On a heat pump you are making four decisions at once, and getting the order wrong is what produces the forum complaint about the electric bill. Work through these before you pick a model.
The 6-point compatibility checklist
Run through these six checks in order, and you will know within ten minutes whether a given model fits your system.
How many stages does your heat pump have? Look at the W and W2 terminals behind the existing thermostat, or check the model number on the outdoor unit. A Y2 wire usually means a second cooling stage and often a second heat stage. Note it down, because most marketing copy will not tell you.
Do you have a C-wire? Count the wires. A blue or black wire at the terminal block is almost always the C-wire. If you have three or fewer and no blue, assume you do not, and cross off any pick that requires one.
What is your backup heat? Electric strip heat inside the air handler is one system. A separate gas or oil furnace is a dual-fuel system, which needs load balancing rather than a simple lockout. These are configured completely differently.
What else is on the control line? Whole-house humidifiers, dehumidifiers,ERVs and ventilation dampers all change the wiring. Extra equipment narrows the compatibility percentage and can rule out the cheaper models.
Which terminals are present? R or RC, W, W2, Y, Y2, O, C. A model that cannot address W2 cannot stage a two-stage compressor no matter what its app says.
Where does the thermostat live? A hallway unit reading an unused space will fight you all winter. If the answer is a room sensor, your shortlist is much shorter before you start reading feature lists.
Auxiliary heat lockout and the balancing point
Auxiliary heat, also called strip heat, backup heat, emergency heat or resistance heat, is the electric element in the air handler. It is roughly two and a half to four times more expensive per unit of heat than the heat pump itself, which is the entire reason lockout matters.
The balancing point is the outdoor temperature below which the heat pump can no longer keep the house at setpoint on its own. Below that line, backup heat is genuinely needed. The problem is that many thermostats estimate this poorly and call for auxiliary heat far too early, so you are paying resistance rates on a mild January afternoon.
Set your lockout to a temperature where the heat pump still keeps up comfortably, typically somewhere between 20 and 30 degrees Fahrenheit below the temperature at which you have noticed the house struggling. Cold-climate heat pumps that maintain setpoint down to very low outdoor temperatures may allow a much lower lockout than a standard cold-climate unit.
Check your monthly bills against your thermostat’s runtime data. If the auxiliary heat is running far more than you expect, the first fix is almost always the lockout temperature rather than the thermostat model.
Staging, short cycling and defrost
Staging means the compressor runs at less than full capacity first and only steps up when the house cannot keep up. A two-stage heat pump uses a Y1 and Y2 pair with a W and W2 pair; a three-stage unit adds a third call. A thermostat that only addresses the first stage runs a multi-stage system as a single-stage one.
Short cycling is the opposite problem, where the compressor starts and stops repeatedly. It happens when schedules are aggressive and differentials are tight. A heat pump that cycles constantly burns compressor life and never reaches the efficiency the equipment was designed for.
Defrost adds a layer owners rarely consider. During a defrost cycle the outdoor unit reverses to melt ice, and it may briefly call for backup heat to hold the house steady. Some thermostats are better at suppressing auxiliary heat during that window than others, and this is a normal, occasional event rather than a fault.
C-wire, power extenders and no-C-wire retrofits
The C-wire carries continuous low-voltage power so the thermostat has something to draw on when the HVAC system is idle. Traditional thermostats ran on batteries and never needed one. Most modern smart thermostats with color screens, Wi-Fi and occupancy sensing do.
You have three retrofit paths. The ecobee Enhanced, Premium and the Sensi ST55 include a Power Extender Kit that uses the equipment’s transformer to supply power at the wall. The Sensi Touch and the Honeywell Vision Pro 8000 need a real C-wire or a 24V AC transformer of at least 300 mA, which may mean running new wire. The Nest and Sensi Lite can often run without one, but both still want a C-wire or power accessory for heat pump systems.
Do not remove the old thermostat until power is confirmed at the new location. Every extra step here turns a 20 minute job into a service call.
Dual-fuel systems and load balancing
On a dual-fuel system the thermostat is not deciding between cheap and expensive heat, it is deciding between two different furnaces. Load balancing lets you set a delay threshold, the number of minutes the gas furnace must wait before it is allowed to start once the heat pump calls for heat.
Set the delay long enough that the heat pump gets a fair chance to recover, and short enough that nobody notices a cold house. A generous delay in a well-insulated home is usually correct, because the heat pump will get there. In a leaky old house, a short delay keeps comfort on your side of the trade.
None of the consumer models on this list advertises full dual-fuel load balancing with adjustable delay thresholds, which is why dual-fuel owners frequently stay with an installer-programmed staging thermostat. If you need true load balancing, ask your HVAC contractor what they program, because they will often recommend keeping the equipment thermostat.
The 20-degree setback rule for heat pumps
The common advice is not to set back more than about 20 degrees on a heat pump. The reasoning is recovery time. A heat pump delivering heat at moderate capacity takes a long time to lift a cold house, and during that recovery the thermostat may allow backup heat to assist, which is the expensive outcome you were trying to avoid.
Keep night setbacks at 8 to 10 degrees for the same reason, and lean on occupancy scheduling rather than temperature swings. A thermostat that knows nobody is home can hold a mild temperature all day without anyone paying resistance rates to recover it later. If you are also shopping for a humidifier, our nursery humidifier guide covers the seasonal side.
Home Assistant, local control and privacy
A meaningful share of the people searching this topic want their thermostat inside a local automation system rather than in someone else’s cloud. Thermostats that integrate cleanly with Home Assistant come up constantly on r/homeassistant and community.home-assistant.io, and the practical difference is that local control keeps your schedule, occupancy and HVAC data on your own hardware.
Units with open or documented integration paths give you more freedom, and Sensi states plainly that it does not sell personal information or use thermostat activity for advertising, which is worth something in a privacy sense. On the other side, some ecobee security features require a subscription.
If local control is a hard requirement, check the integration status for your specific model before buying rather than assuming a brand name implies it.
Placement, and replacing a factory thermostat
Install the thermostat on an interior wall, in a lived-in room, roughly 5 feet above the floor. Keep it away from supply and return vents, windows with direct sun, and any spot where a heat pump’s discharge air reaches it. On a heat pump home the hallway position is the most common mistake we see, and it is why room sensors exist.
If your heat pump came with a Carrier, Lennox or Trane factory thermostat, you can generally replace it, but you may lose equipment-specific features such as fault codes, filter life tied to the unit, or proprietary staging logic. A parts supplier can confirm whether the unit is a standard 24V system before you buy anything.
How we chose
We ranked staging support first, then auxiliary heat control, then C-wire behavior, then humidity handling and wiring depth, with screens and voice assistants last. Ratings and review counts are copied from the current product data, verified on September 2026, and every model listed here is verified for 24V low-voltage systems.
One product is shown at the top of this list, and we also weighed the full breadth of smart home gear when testing scheduling behavior against everyday routines. For general home tech, our smart TV picks cover a different corner of the connected home.
Frequently Asked Questions
Can you put a smart thermostat on a heat pump?
Yes. Every model in this roundup is a 24V low-voltage thermostat rated for heat pump equipment, and all of them replace your existing wall unit and call for heat through the same terminals. The two things to confirm first are your stage count, which tells you whether you need a unit that addresses W2 and Y2, and your C-wire situation, since many heat pump systems need continuous power. Check both before you order.
At what temperature should a heat pump switch to auxiliary heat?
Set the lockout so backup heat only engages when the heat pump genuinely cannot keep up, which is usually 20 to 30 degrees Fahrenheit below the outdoor temperature where you notice the house falling behind. A heat pump delivers two and a half to four times more heat per unit of electricity than resistance backup heat, so every degree you delay auxiliary heat saves real money. If your monthly bills disagree with your thermostat’s runtime data, the lockout is the first thing to change.
Does auxiliary heat run your bill up?
Yes, significantly. Electric resistance auxiliary heat costs roughly two and a half to four times more per unit of delivered heat than the heat pump’s compressor, because the compressor moves heat rather than generating it. A thermostat with a poorly set lockout can call for backup heat on a mild afternoon and double or triple the cost of that hour. This is the single biggest reason to get the lockout right before the heating season rather than after.
Do I need a C-wire for a smart thermostat?
It depends on the model and the system. The ecobee Premium and Enhanced and the Sensi ST55 include a Power Extender Kit and often install without one, while the Sensi Touch and Honeywell Vision Pro 8000 need a real C-wire or a 24V AC transformer of at least 300 mA. On heat pumps specifically, both the Nest and the Sensi Lite still want a C-wire or power accessory. Look for a blue or black wire at your existing terminal block before choosing.
Why do HVAC guys hate nest thermostats?
The objection is about control granularity rather than quality. Nest learns its own schedule and gives limited manual control over staging differentials and lockout temperatures, which are the two settings an installer tunes when matching a heat pump to a specific house. Nest also does not handle aggressive setbacks well on a heat pump, because the slower recovery invites backup heat. Technicians who prefer Honeywell staging thermostats say it is about having every setting available, not about the thermostat being unreliable.
Which Smart Thermostat for Heat Pumps Should You Buy?
For most air-source heat pump homes, the best smart thermostats for heat pumps list puts the Sensi Smart Thermostat ST55 first. It is rated for heat pumps, it needs a C-wire only in the minority of homes that lack one, it installs in about 15 minutes, and its 4.4 rating across more than 23000 reviews is backed by owners who report real setup and scheduling success.
Pick the Sensi Touch ST75 instead if your thermostat location has a C-wire and you want a readable color screen and the highest rating in the group. Pick the ecobee Premium if your house has a genuinely uncomfortable room, because the included SmartSensor solves the hot bedroom and cold hallway problem that no other pick here addresses out of the box.
On a two-stage heat pump, the Honeywell Lyric T6 Pro is specified in staging terms rather than in app terms. On a three-stage heat pump, a dual-fuel system, or anything where an installer needs real staging differentials, the Honeywell Vision Pro 8000 is the tool that matches the equipment, and it is a professional install rather than a weekend project.
Whatever you choose, set the auxiliary heat lockout and keep night setbacks to 10 degrees or less before the first cold snap. That single configuration step is worth more than any feature on this list. For general home tech, we also track the baby monitors for adults picks that readers ask about most.