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Heating and cooling are the biggest part of most home energy bills. A smart thermostat learns your schedule, adjusts when nobody is home and lets you change the temperature from your phone. Here are the three we would choose in 2026.
Our Picks at a Glance
- Best Overall: Google Nest Learning Thermostat (4th gen)
- Best for Room-by-Room Comfort: ecobee Smart Thermostat Premium
- Best Budget: Honeywell Home RTH9585WF Smart Color Thermostat
1. Google Nest Learning Thermostat (4th gen) — Best Overall
Google's newest and smartest Nest, with a bigger screen, a remote temperature sensor in the box and Matter support.
- Google says it can help save up to 31% on heating and cooling
- Includes Nest Temperature Sensor (2nd gen) for hot and cold spots
- No C-wire needed in most homes; works with most 24V systems
- Works with Google, Alexa and Siri speakers; Matter compatible
- Amazon rating 4.4/5 (2,600+ ratings)
Pros: beautiful design, strong savings features, broad compatibility.
Cons: premium price; best experience in the Google Home app.
Best for: most homes, especially Google users.
2. ecobee Smart Thermostat Premium — Best for Room-by-Room Comfort
ecobee's top model comes with a SmartSensor, a built-in air quality monitor and a smart speaker.
- ENERGY STAR certified; ecobee says up to 26% savings vs a 72°F hold
- Included SmartSensor balances temperature in the rooms you use
- Built-in air quality monitor and Siri or Alexa speaker
- Power Extender Kit for homes without a C-wire; 3-year warranty
- Amazon rating 4.3/5 (4,000+ ratings)
Pros: room sensors, air quality alerts, works without a C-wire.
Cons: more features than some people need.
Best for: homes with hot and cold rooms.
3. Honeywell Home RTH9585WF Smart Color Thermostat — Best Budget
A simple, proven Wi-Fi thermostat from a classic HVAC brand, with a customizable color touchscreen.
- 7-day programmable schedule, Wi-Fi control
- ENERGY STAR certified with monthly energy reports
- Works with Alexa
- C-wire required; not for electric baseboard heat
- Amazon rating 4.3/5 (20,000+ ratings)
Pros: affordable, reliable, very popular.
Cons: needs a C-wire; no learning or room sensors.
Best for: budget upgrades in homes that already have a C-wire.
Side-by-Side Comparison
| Nest Learning (4th gen) | ecobee Premium | Honeywell RTH9585WF | |
|---|---|---|---|
| Room sensor included | Yes | Yes | No |
| C-wire needed | Not in most homes | No (adapter included) | Yes |
| Learning schedule | Yes | Yes | No (programmable) |
| Voice assistant | Works with Google/Alexa/Siri | Built-in Siri or Alexa | Works with Alexa |
| Amazon rating | 4.4 | 4.3 | 4.3 |
From the Amazon listings and manufacturers' websites, checked October 2026. Amazon ratings change daily. Prices change often, so we do not list them here.
What to Look For
- Compatibility with your HVAC system (use the brand's checker).
- C-wire requirements.
- Room sensors for uneven temperatures.
- Utility rebates: many energy companies offer rebates on ENERGY STAR smart thermostats.
Deep dive: read our full ecobee Smart Thermostat Premium review.
How we choose: we have not lab-tested these products ourselves. Our picks are based on manufacturer specifications, the Amazon listings and recurring themes in buyer reviews, checked in October 2026. We favor products with strong ratings from large numbers of buyers.
FAQ
Do I need a C-wire?
It depends. Google says the Nest Learning Thermostat (4th gen) works without a C-wire in most homes; the ecobee Premium includes a Power Extender Kit for homes without one; the Honeywell RTH9585WF requires a C-wire.
How much can a smart thermostat save?
Google says the Nest Learning Thermostat can help save up to 31% on heating and cooling bills, and ecobee says up to 26% compared with a 72°F hold. Real savings depend on your home and habits.
Can I install it myself?
Usually yes, in under an hour, if your system is a standard 24V system. Check each brand's compatibility checker first. Line-voltage electric baseboard heat is not compatible with these models.
Do they work with Alexa and Google?
Yes. The Nest works with Google Assistant, Alexa and Siri smart speakers (and Matter); the ecobee Premium has Siri or Alexa built in; the Honeywell works with Alexa.
Affiliate Disclosure: As an Amazon Associate, I earn from qualifying purchases. This means if you click on a link and make a purchase, I may receive a small commission at no extra cost to you. Product details and ratings on Amazon change often, so check the current listing before you buy.