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The best smart thermostats do more than let you change the temperature from your phone. They learn your schedule, balance hot and cold rooms with remote sensors, drop the heat when nobody is home and show you where your energy money goes. With heating season here, we compared specs, expert testing and owner reviews of the current Nest, ecobee, Honeywell Home, Sensi and Amazon lineups and narrowed the field to nine picks for different homes, wiring setups and budgets.
Part of our Home Comfort, Backup Power & Tool Guides.
Quick picks
| Product | Best for | Price range | |
|---|---|---|---|
| Google Nest Learning Thermostat (4th Gen) | Best overall | $$$ | See price |
| ecobee Smart Thermostat Premium | Smart home and air quality | $$$ | See price |
| ecobee Smart Thermostat Enhanced | Built-in occupancy sensing | $$ | See price |
| Honeywell Home T9 Smart Thermostat with Sensor | Hot and cold rooms | $$ | See price |
| Honeywell Home X8S Smart Thermostat | Whole-home comfort control | $$$ | See price |
| Sensi Touch 2 Smart Thermostat | Big, traditional touchscreen | $$ | See price |
| Honeywell Home X2S Smart Thermostat | Best value with Matter | $ | See price |
| Google Nest Thermostat | Budget Google Home pick | $-$$ | See price |
| Amazon Smart Thermostat | Alexa homes | $ | See price |
Price tiers: $ = under $100, $$ = $100 to $200, $$$ = over $200.
1. Google Nest Learning Thermostat (4th Gen): Best Overall
The fourth-generation Nest Learning Thermostat is the most polished way to make an ordinary heating and cooling system feel smart. It still learns your habits and builds a schedule on its own, but the redesign brings a much larger, edge-to-edge display that changes what it shows as you walk up, plus built-in Matter support so it is no longer locked to Google Home. A Nest Temperature Sensor now comes in the box, so you can tell it to prioritize a bedroom or nursery instead of the hallway where it hangs. It costs more than most rivals, but it is the one to get if you want something that looks good on the wall and mostly runs itself.
Key specs
- Display: large curved LCD, roughly 60% bigger than the previous model’s
- Included: one Nest Temperature Sensor (2nd Gen)
- Smart home: Google Home app, Matter (works with Apple Home through Matter)
- C-wire: not required in most homes thanks to its power-sharing design
- Wi-Fi: 2.4 GHz and 5 GHz
👍 Pros
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👎 Cons
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What owners say: Owners love the bigger screen and how quickly it settles into a sensible schedule; the most common complaint is the premium price, especially for those adding several sensors.
2. ecobee Smart Thermostat Premium: Best for Smart Homes
The ecobee Premium is the feature-packed choice for anyone who already lives in a connected home. It has Alexa built in, works with Siri, Apple HomeKit, Google Assistant, SmartThings and IFTTT, and includes a SmartSensor that reads temperature and occupancy in a second room. It also monitors indoor air quality and can alert you when the house needs fresh air. Zone-style scheduling lets you decide which rooms matter at which times, and it can control accessories such as a whole-home humidifier. Expect to need a C-wire or ecobee’s included power adapter approach.
Key specs
- Included: one SmartSensor for remote temperature and occupancy
- Voice: built-in Alexa and Siri support
- Smart home: Apple HomeKit, Google Assistant, SmartThings, IFTTT
- Extras: indoor air quality monitoring, geofencing, accessory control
- C-wire: required, or use a power extender kit
👍 Pros
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👎 Cons
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What owners say: Buyers rave about evening out hot and cold rooms with the sensors and like the detailed reports; some mention a learning curve in the app and occasional sensor connection hiccups.
3. ecobee Smart Thermostat Enhanced: Best Built-In Occupancy Sensing
The Enhanced drops the Premium’s air quality monitoring, speaker and included room sensor, but keeps the core ecobee experience for a lower price. Its built-in radar presence detection notices when someone is home and adjusts accordingly, and reviewers found its temperature control accurate. It works with the same wide range of voice assistants and smart home platforms, and you can add SmartSensors later if a bedroom or office runs warm or cold.
Key specs
- Built-in sensors: temperature, humidity and radar-based occupancy
- Included: no external room sensor (sold separately)
- Smart home: works with Alexa, Google Assistant, Apple HomeKit and SmartThings
- C-wire: required, or use a power extender kit
👍 Pros
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👎 Cons
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What owners say: Owners like the clean interface and reliable schedules; the main complaint is that the room sensors that make ecobee shine are an extra purchase.
4. Honeywell Home T9 Smart Thermostat with Sensor: Best for Hot and Cold Rooms
If your upstairs bakes while the basement freezes, the T9 is built for you. It supports up to 20 wireless room sensors that read temperature, humidity and motion, and you can tell it which room to prioritize at different times of day. Geofencing and vacation modes round out the energy-saving features, and testers found it accurate. The touchscreen is easy to read and the app is straightforward. It needs a C-wire, and while Honeywell markets it as a DIY install, one expert tester chose to hire a pro.
Key specs
- Room sensors: up to 20, reading temperature, humidity and motion
- Display: 3.5-inch color touchscreen
- Voice: Alexa, Google Assistant, SmartThings
- C-wire: required
👍 Pros
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👎 Cons
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What owners say: Reviewers often say the sensors finally fixed a problem room; some report the app occasionally needs to reconnect.
5. Honeywell Home X8S Smart Thermostat: Best for Whole-Home Comfort Control
The X8S is Honeywell Home’s flagship, with a 5-inch touchscreen, indoor air quality monitoring and support for up to 20 optional room sensors with motion-based automation. It is Matter compatible, offers advanced energy features and can tie in with supported video doorbells. It is the most expensive Honeywell Home model, and some reviewers ran into setup snags in the app, but it is a strong alternative to the ecobee Premium for people who prefer a larger screen.
Key specs
- Display: 5-inch touchscreen
- Room sensors: up to 20, optional
- Extras: indoor air quality monitoring, motion automation
- Smart home: Matter compatible
- C-wire: required (adapter available)
👍 Pros
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👎 Cons
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What owners say: Buyers like the bright display and the extra data it surfaces; a few say setup took longer than expected.
6. Sensi Touch 2 Smart Thermostat: Best Traditional-Style Touchscreen
The Sensi Touch 2 is a great fit for anyone who wants smart features without a futuristic gadget on the wall. Its large glass touchscreen is easy to read, setup is guided step by step through the app, and it sends helpful maintenance alerts and usage reports. It supports optional room sensors that track temperature and humidity, and it is Energy Star certified. Sensi also gets credit for a clear privacy commitment.
Key specs
- Display: large color glass touchscreen
- Room sensors: optional, sold separately
- Voice: Alexa, Google Assistant, SmartThings
- Certification: Energy Star
👍 Pros
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👎 Cons
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What owners say: Owners praise how simple it is for everyone in the house to use; the plain look is the usual critique.
7. Honeywell Home X2S Smart Thermostat: Best Value
The X2S proves you do not need to spend much to get a capable smart thermostat. It is Matter certified and works with Apple Home, Alexa and Google Assistant, and it adds humidity monitoring, auto-away and filter reminders. Physical buttons and a simple LCD will feel familiar to anyone replacing an old programmable unit. There is no room sensor support and it needs a C-wire, but for a single-zone home on a budget it is hard to beat.
Key specs
- Display: small LCD with physical buttons
- Smart home: Matter certified; Apple Home, Alexa, Google Assistant
- Extras: humidity readout, auto-away, filter reminders
- C-wire: required
- Certification: Energy Star
👍 Pros
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👎 Cons
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What owners say: Buyers call it a no-fuss upgrade from a dumb thermostat; some had trouble during initial app pairing.
8. Google Nest Thermostat: Best Budget Pick for Google Homes
The standard Nest Thermostat brings Google’s easy app, energy-saving suggestions and Alexa or Google Assistant voice control at a much lower price than the Learning model. It does not learn your schedule automatically and does not work with Nest temperature sensors, and the trim plate for covering old paint marks is sold separately. Google says most homes will not need a C-wire, though reviewers had better luck with one connected.
Key specs
- Control: touch-sensitive side, Google Home app
- Voice: Alexa and Google Assistant
- Room sensors: not supported
- C-wire: not required in many homes, but recommended
👍 Pros
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👎 Cons
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What owners say: Owners like the simple setup and app; complaints usually involve power issues on systems without a C-wire.
9. Amazon Smart Thermostat: Best for Alexa Users
Amazon’s thermostat is one of the cheapest ways into a smart thermostat, and it is built around Alexa routines and Hunches. Its large digits are easy to read from across the room, and it offers basic energy tracking. It does not support Google Home, HomeKit or remote room sensors, and it needs a C-wire, though Amazon sells a version bundled with a power adapter for older wiring.
Key specs
- Display: large, easy-to-read digits
- Smart home: Alexa only
- Room sensors: not supported
- C-wire: required, or buy the bundle with a power adapter
👍 Pros
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👎 Cons
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What owners say: Alexa households like controlling heat by voice and through routines; buyers without a C-wire sometimes wish they had picked the adapter bundle from the start.
How to choose the best smart thermostat
Check your wiring first. Pull the old thermostat off the wall plate (with the power off at the breaker or furnace switch) and photograph the wires. Most smart thermostats need a C-wire, the common wire that delivers constant power. If you do not have one, look at models that work without it, such as the Nest Learning Thermostat, or ones that include a power adapter kit.
Confirm system compatibility. Gas, electric and oil furnaces, central air and most heat pumps are widely supported. Line-voltage baseboard heat (120V or 240V) is not compatible with these low-voltage thermostats. Use each brand’s online compatibility checker before buying.
Decide if you need room sensors. In a two-story house or one with a drafty bedroom, remote sensors are the single biggest comfort upgrade. ecobee, Honeywell Home T9 and X8S, Sensi and the Nest Learning Thermostat all support them.
Match your smart home platform. Matter support (Nest Learning 4th Gen, Honeywell X2S and X8S) means broad compatibility. Otherwise, check for Alexa, Google Assistant or Apple HomeKit support.
Learning vs. scheduling. Learning models build a schedule for you; others rely on a schedule you set plus geofencing. Both can save energy if you actually use the features.
Look for rebates. Many utilities offer rebates for Energy Star certified smart thermostats, which can take a big bite out of the price.
Installer tip from our HVAC team: Label each wire with the terminal letter it came off before you disconnect anything, and do not go by wire color alone, since older installs often ignore color conventions. If you have a heat pump, a dual-fuel system or more than one zone, it is worth having a pro handle the install.
FAQ
Do smart thermostats really save money?
They can. Savings come from setting back temperatures while you sleep or are away, which smart thermostats automate. Actual savings depend on your climate, home and habits, so treat brand estimates as a best case.
What if I don’t have a C-wire?
You have three options: choose a model designed to work without one, use the power adapter or extender kit some brands include, or have an HVAC technician run a new wire. A thermostat that is not getting enough power can behave erratically, so do not ignore the warning signs.
Can I install a smart thermostat myself?
Most people with a standard low-voltage system can, in under an hour, by following the app’s guided setup. Always turn off power to the HVAC system first and follow the manufacturer’s instructions. Call a pro for heat pumps with auxiliary heat, multi-stage systems or anything unfamiliar.
Which smart thermostat works with Apple Home?
The ecobee models work with HomeKit, and Matter-certified models such as the Nest Learning Thermostat (4th Gen) and Honeywell Home X2S can be added to Apple Home through Matter.
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- The Best Space Heaters of 2026
- The Best Humidifiers of 2026 for Dry Winter Air
- The Best Air Purifiers of 2026
- Winter Storm and Power Outage Prep
- Home Comfort, Backup Power & Tool Guides
Sources
Reviewed: The best smart thermostats; HGTV: Best Smart Thermostats, Tested and Reviewed; Bob Vila: Best smart thermostats; Tom’s Guide: Nest Learning Thermostat (4th Gen) review. Owner feedback is summarized in our own words from public reviews. Photos courtesy of Unsplash.