The Best Smart Thermostats for Heat Pumps

If your system has any complexity at all, this is the safe answer. ecobee's specifications cover single-stage, two-stage and dual-fuel heat pumps, plus dehumidification control — the broadest compatibility in the universal thermostat market. That matters because heat pump wiring varies a lot. A dual-fuel setup with a gas furnace backup needs outdoor temperature lockout, and this one has it. Most competitors at this level make you pick a lane.

The included SmartSensor is the feature you'll notice day to day. It reads temperature and occupancy in another room and averages it in, so the thermostat isn't just guessing based on a hallway wall. Wirecutter's long-term reporting found the follow-me sensor behavior cut comfort complaints and thermostat overrides by an estimated 15 to 20 percent in multi-story homes with heat pumps. If your upstairs runs warm and your bedroom runs cold, that's the fix.

Consumer Reports placed ecobee models first in owner satisfaction specifically among heat pump users, citing stage-switching logic and app control. That's a narrower and more useful finding than a general ratings win. Heat pumps live or die on when the thermostat decides to call for auxiliary heat, and ecobee's staging is conservative about it. Owners upgrading from older thermostats consistently report the system runs less and holds temperature better.

The Power Extender Kit in the box solves the most common install failure. Roughly 30 percent of DIY smart thermostat installs on heat pumps need an HVAC tech to follow up, usually because there's no C-wire or the multi-stage wiring got crossed — well above the rate for plain gas furnaces. The PEK gives you a workaround. It's not elegant, and you're working inside the air handler, but it beats a service call.

You also get a fair amount of hardware for the money: a bright metal-sided display, built-in air quality monitoring with filter reminders, radar-based occupancy sensing, and a speaker with your choice of Alexa or Siri. None of that helps your heat pump. But if you were going to add a smart speaker anyway, it's a reasonable place to consolidate.

Flaws but not dealbreakers

Owners with heat pumps and auxiliary heat have raised real complaints about behavior when the internet connection drops, which is worth knowing if your service is unreliable. A thermostat that leans on the cloud is a thermostat that can get confused offline. If you're rural and your Wi-Fi is spotty, weigh that carefully.

The Power Extender Kit is a compromise, not a solution. It works, but it means opening your air handler and repurposing a wire, and the instructions assume more comfort with HVAC panels than a lot of buyers have. If you can run a proper C-wire instead, do that.

It's the priciest universal thermostat here, and much of what you're paying for — the speaker, the air quality sensor, the radar — has nothing to do with running a heat pump well.

Installation is where this one wins. Bob Vila clocked an average 28-minute DIY install on compatible heat pump systems, against 45-plus minutes for ecobee and Nest. The app walks you through it over Bluetooth, which means you're not fighting a Wi-Fi setup while standing on a stepladder with the wires loose. For a lot of people that difference is the whole decision.

It handles the heat pump basics without asking you to think about them. Auxiliary and emergency heat terminals are supported, and you can set the outdoor temperature threshold that brings backup heat online. Owners upgrading from thermostats that wouldn't stage aux heat properly consistently report this one just does it. That's the unglamorous job a heat pump thermostat exists to do.

Emerson states plainly that it won't sell your personal information to third parties, which is not something Google or Amazon says about their thermostats. If you've been hesitant to put a connected sensor on your wall that knows when you're home, this is the one in the group built around that concern. It's a real differentiator, not marketing garnish.

It's ENERGY STAR certified, which matters beyond the energy math — a lot of utility rebate programs require certification, and that can meaningfully change what you actually pay. The three-year warranty is also longer than what most universal thermostats offer.

Flaws but not dealbreakers

Room sensors are sold separately, so a multi-room setup costs more than the sticker suggests. If sensor coverage is the reason you're upgrading, the ecobee's included sensor closes much of the gap.

Humidity control is the soft spot. Some owners report it working through the first season and then falling off, which is annoying if you were counting on it for a muggy summer. Basic heating and cooling control doesn't seem affected.

A C-wire is required — no power extender in the box. If your heat pump wiring doesn't include one, budget for adding it or pick something else.

The Sensi Touch 2 comes with a three-year warranty.

The learning behavior is genuinely useful on a heat pump. Heat pumps ramp slowly, so a thermostat that already knows you get up at six and start the recovery early avoids the panic response that triggers auxiliary heat. Home/Away Assist does the same thing in reverse when you leave. Google claims up to 31 percent savings on heating and cooling; treat that as a ceiling, not a promise.

Compatibility is broad — most 24V systems including heat pumps, gas, electric, oil, forced air and radiant. The bundled second-gen temperature sensor lets you weight a bedroom or a home office instead of the hallway. And Matter support means it plugs into Alexa, Siri or Google Assistant setups rather than locking you to one app, which wasn't true of older Nests.

The display is the best-looking one in this guide by a wide margin, with Dynamic Farsight showing the time or weather from across the room. That sounds like a small thing. But a thermostat sits in your hallway for a decade, and this is the only one people describe as something they're glad to look at.

It also now asks permission before changing your schedule, with notifications in the Google Home app. Earlier Nests had a reputation for quietly deciding things on your behalf and leaving you to figure out why the house felt wrong. This version puts you back in the loop.

Flaws but not dealbreakers

The C-wire situation is the big caveat for heat pump owners. Google's own support documentation says systems without a C-wire need the Nest Power Connector, because power stealing interferes with the O-wire that controls the reversing valve — which shows up as a flickering display and dropped Wi-Fi. Confirm what's behind your current thermostat before ordering.

Mounting hardware changed from the 3rd gen, so this isn't a drop-in swap if you're replacing an older Nest. Some owners upgrading have found their existing setup doesn't carry over cleanly.

You're also buying into Google's ecosystem and its data practices, which is a fair trade for some people and a dealbreaker for others.

This is the one to get if you want a connected thermostat and nothing more. It handles conventional and heat pump systems, connects over Wi-Fi through the app, and works with Alexa, Google Assistant and Apple Home. Matter certification means it should keep working as smart home platforms shift around. For a rental, a second zone, or a house you're not staying in forever, that's enough.

The scheduling is more flexible than the price suggests: 5-1-1 day, 5-2 day, 7-day or weekly, plus a non-programmable mode if you just want a thermostat that holds a number. Auto-away handles the rest. There's also an extended 32°F low-heat setpoint, which is handy for a garage or a vacation property you're keeping above freezing.

It's ENERGY STAR certified and built for utility demand-response programs, so it's likely to qualify for rebates. The five-year warranty is the longest in this guide by two years. Honeywell has been making thermostats for a very long time, and the hardware here is deliberately unambitious in a way that tends to age well.

Flaws but not dealbreakers

It can't be recalibrated, which is the complaint that stands out. RTINGS' lab work found budget smart thermostats running ±2°F off internally, and on a heat pump that variance can trigger auxiliary heat you didn't need — wiping out the savings you bought the thermostat for. If your unit reads a few degrees off, you can't correct it in software.

A C-wire is required, and there's no adapter in the box. Check your wiring first.

There are no remote room sensors and no learning behavior, so a multi-story house with uneven temperatures won't get much help here. This is a straightforward scheduler with an app attached.

The Focus PRO S200 includes a five-year warranty.