29% OFF
$56.99
$79.99
Also sold in packs
- Pack of 231% OFF$109.99$159.98$54.99 per unitYou save $3.99Buy
Updated November 2026
Data from the official Amazon and Sensi sites.
2026 verdict
The Sensi Smart thermostat is the stronger buy of this pair, backed by a higher owner rating and a 3 year warranty against the Amazon Smart Thermostat's one year.
It extends past Alexa to Google Home, Samsung SmartThings and Home Assistant, and it adds a humidity sensor next to its temperature sensor, something the Amazon Smart Thermostat does not have. The Amazon Smart Thermostat answers back with a lower price and a C-wire adapter already in the box, which removes the single most common reason a thermostat installation stalls. Neither one reaches Apple HomeKit or Matter. Pick the Amazon Smart Thermostat for the cheapest, simplest Alexa-only install, and the Sensi Smart thermostat for wider platform support, humidity sensing and the longer warranty.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Winner
31% OFF
$89.99
$129.99
Connectivity
- Wi-Fi 2.4 GHz
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| Feature | Amazon Smart Thermostat | Sensi Smart thermostat | Winner |
|---|---|---|---|
| Price | $56.99 | $89.99 | Amazon Smart Thermostat |
| Rating | 4.0 | 4.4 | Sensi Smart thermostat |
| Warranty | 1 year | 3 years | Sensi Smart thermostat |
| Included accessories | Trim Plate | None | Amazon Smart Thermostat |
| Integrations | Alexa | Google Home, Alexa, Samsung SmartThings, Home Assistant | Sensi Smart thermostat |
| Sensors | Temperature | Temperature, Humidity | Sensi Smart thermostat |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi | Tie |
| Screen | YES | YES | Tie |
| Energy Savings | YES | YES | Tie |
| System Health Monitor | NO | NO | Tie |
| Voice Control | YES | YES | Tie |
| Speaker | NO | NO | Tie |
What the differences mean
Smart home platforms
The Sensi Smart thermostat works with Google Home, Samsung SmartThings and Home Assistant on top of Alexa. The Amazon Smart Thermostat answers only to Alexa, so a Google Home or SmartThings household gets no integration at all from it.
Humidity sensing
The Sensi Smart thermostat reads room humidity alongside temperature. The Amazon Smart Thermostat has no humidity sensor of any kind, so it decides everything from temperature alone.
Warranty
The Sensi Smart thermostat carries a 3 year warranty against the Amazon Smart Thermostat's 1 year, a meaningful gap for a device meant to run unattended for years.
What ships in the box
The Amazon Smart Thermostat includes a C-wire adapter, which solves the most common reason a smart thermostat install stalls. The Sensi Smart thermostat ships without one, so a home with no common wire runs it on two AA batteries instead.
Which one to buy if
- you use Google Home, Samsung SmartThings or Home Assistant alongside Alexa
The Sensi Smart thermostat works with all of them; the Amazon Smart Thermostat only ever answers to Alexa.
- you want humidity tracked along with temperature
The Sensi Smart thermostat has a humidity sensor built in, and the Amazon Smart Thermostat does not.
- you have no C-wire and want the simplest possible install
The Amazon Smart Thermostat ships with a C-wire adapter, while Sensi Smart thermostat owners without one report running it on AA batteries that need monthly changing.
- you live entirely in the Alexa ecosystem and price comes first
The Amazon Smart Thermostat is the cheaper of the two and asks nothing beyond Alexa.
29% OFF
$56.99
$79.99
- + Price: $56.99
- + Included accessories: Trim Plate
- - Rating: 4.0 vs 4.4
- - Warranty: 1 year vs 3 years
Winner
31% OFF
$89.99
$129.99
- + Rating: 4.4
- + Warranty: 3 years
- + Integrations: Google Home, Alexa, Samsung SmartThings, Home Assistant
- - Price: $89.99 vs $56.99
- - Included accessories: None vs Trim Plate
What owners say
Sensi Smart thermostat owners describe an install guided step by step by the app, matching old wiring to new terminals in minutes, and then a thermostat many say they forget about because it keeps working. They single out the physical buttons and large display, geofencing that adjusts the schedule as they leave and come back, a fan setting that circulates air for part of each hour, and HVAC runtime reports in the app. The complaints that come up are a Wi-Fi connection that drops now and then before reconnecting on its own, an app that only accepts a US or Canadian address, and, on units run without a common wire, batteries that some report replacing every month.
Frequently Asked Questions
Which is better overall: Amazon Smart Thermostat or Sensi Smart thermostat?
The Sensi Smart thermostat, for its wider platform support, humidity sensing and longer warranty. The Amazon Smart Thermostat is the better choice only for an Alexa-only home that wants the lowest price and a C-wire adapter already in the box.
What is the biggest difference between the Amazon Smart Thermostat and the Sensi Smart thermostat?
Platform support. The Amazon Smart Thermostat works only with Alexa, while the Sensi Smart thermostat also reaches Google Home, Samsung SmartThings and Home Assistant, and it adds humidity sensing the Amazon Smart Thermostat lacks.
Does the Amazon Smart Thermostat work with Google Home?
No. Alexa is its only supported platform; there is no Google Home, Apple HomeKit, SmartThings or Home Assistant integration.
Does the Sensi Smart thermostat need a C-wire?
Not always: it can run on two AA batteries, but owners without a common wire report replacing them monthly, so a C-wire or separate transformer is the more reliable setup.
Who should buy the Amazon Smart Thermostat?
An Alexa-only household with no C-wire that wants the lowest possible price on a smart thermostat and does not need humidity sensing or another platform.
Who should buy the Sensi Smart thermostat?
Buyers who split their smart home across Google Home, SmartThings or Home Assistant, want humidity tracked alongside temperature, and value a longer warranty.
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