Google Nest Thermostat (2020) Review: Would Owners Buy It Again?
Disclosure: As an Amazon Associate I earn from qualifying purchases. If you buy through links on this page we may earn a commission at no extra cost to you. How this review was made: We did not test this thermostat in person. This verdict is based on our analysis of a long-term expert review, compatibility guides and owner-reported themes, all listed at the end of this article. Our method.
A good basic smart thermostat, if your wiring cooperates
Android Central's two-month review rated the Nest Thermostat 4 out of 5 for its easy install, clean design, schedules, presence-based Eco mode and HVAC alerts. But it does not learn your habits, works only through the Google Home app, has no remote room sensors, and needs a C-wire or adapter to run reliably in many homes. Without one, owners report Wi-Fi drops, a dark display, low-power errors and short cycling. In a simple system with a C-wire, owners are happy; in heat pumps or complex setups, look elsewhere.
Check current price on Amazon → Prices and availability change often, so we don't list them here.Buy it again if you…
- have a standard furnace and central air with a C-wire
- already use Google Home or Nest devices
- are happy to set your own schedule
Skip it if you…
- have no C-wire and do not want to add one or an adapter
- have a heat pump with backup heat or a multi-zone system
- want remote room sensors for even temperatures
The Google Nest Thermostat (2020) is Google's entry-level smart thermostat. It has a mirrored front with a small color display, a touch strip on the side instead of a turning ring, and three presets: Comfort, Eco and Sleep.
We read a long-term hands-on review, wiring guides and owner-reported themes, with a focus on the C-wire question that decides whether many owners love it or regret it.
What owners say, at a glance
Bars show our editorial summary of how consistently owners praise or complain about each area across all sources — not a lab measurement.
The key specs
| Display | 2.4-inch color display, side touch strip |
|---|---|
| Learning | No; you set schedules with Comfort, Eco and Sleep presets |
| Sensors | Built-in presence, temperature, humidity and light; no remote sensors |
| Power | Can borrow power from HVAC wires, but a C-wire or Nest adapter is recommended |
| Systems | Most North American systems; 2-stage heat or 2-stage cool, not both |
| App | Google Home |
| Wi-Fi | 2.4 and 5 GHz, plus Bluetooth |
What owners love
What owners complain about
Will it work in your home?
ShopSavvy's guide says it usually works without a C-wire on standard gas furnaces with central air and basic systems, but problems are more likely with heat pumps (especially with backup heat), very efficient systems that run for long stretches, and older or unusual systems. If you see warning signs, adding a C-wire or Nest's power adapter is the usual fix. Check Google's online compatibility tool before buying.
Tips from owners
- Photograph your old wiring before removing your current thermostat.
- Plan for a C-wire or adapter if you have a heat pump or see Wi-Fi drops.
- Adjust Eco temperatures if the house gets too cold or warm when you leave.
- Get the trim plate if your old thermostat left a larger footprint.
Pros and cons
What owners love
- Easy install for most homes
- Clean, low-profile design
- Simple presets and schedules
- Presence-based Eco mode
- HVAC problem alerts
What owners complain about
- Often needs a C-wire or adapter to run reliably
- Does not learn your habits
- No remote room sensors
- Google Home app only
- Trim plate sold separately
Other options owners compare
These are the entry-level smart thermostats most often compared with the Nest Thermostat.
| Model | Key difference | Consider it if… | |
|---|---|---|---|
| Google Nest Thermostat (this review) | Small, stylish, Google Home | You have a simple system and a C-wire | See on Amazon |
| ecobee Smart Thermostat Essential | Larger screen, remote sensor support, 3-year warranty | You want room sensors or Home Assistant support | See on Amazon |
| Amazon Smart Thermostat | Basic, Alexa-focused | You run your home with Alexa | See on Amazon |
Have a C-wire and a simple heating system?
Check the current price, colors and trim plate options on Amazon.
Frequently asked questions
Does the Nest Thermostat need a C-wire?
Not always. It can borrow power from other wires, but reviewers and owners report problems without one, especially with heat pumps and complex systems. A C-wire or Nest's adapter is the usual fix.
Does it learn my schedule?
No. Unlike the Nest Learning Thermostat, you set the schedule using presets.
Can it use room sensors?
No. It only reads the temperature where it is mounted. The ecobee Essential supports remote sensors.
Which app does it use?
The Google Home app.
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Sources we analyzed
- Android Central: Nest Thermostat long-term review — two-month use, C-wire trouble, pros and cons
- ShopSavvy: Does the Nest Thermostat work without a C-wire? — compatibility and warning signs
- Smart Home Compared: Google Nest Thermostat — specs and owner pros and cons
- Smart Home Compared: ecobee Essential vs Nest Thermostat — sensors, warranty, comparison
Figures reflect each source as of October 12, 2026 and may change. We summarize owner feedback in our own words and do not reproduce retailer reviews.