Smart Thermostats / Amazon
Amazon Smart Thermostat
Cheap, Honeywell-built and heavily rebated — but Alexa-only, and a C wire is required.
Overall score 4.5/10
Pros
- + $79.99 list, frequently discounted to $50-60, and rebated by more US utilities than almost anything else here
- + Honeywell Home hardware underneath, so the relay and wiring side is Resideo-grade rather than a no-name design
- + Alexa Hunches away-control works without you configuring a schedule at all
- + Trim plate included in the box, which Copeland charges extra for on the Sensi Touch 2
Cons
- − A C wire is a hard requirement and the adapter is not in the box — the real cost in a four-wire home is the thermostat plus an adapter
- − Alexa only. There is no Google Home, no Apple Home, no HomeKit and no Matter, so it is a dead end outside Amazon's ecosystem
- − Most settings are not on the thermostat itself; without a phone and the Alexa app you can barely configure it
- − No remote sensors of any kind — the Echo comfort-zone workaround is not the same as a real room sensor
- − Amazon publishes no stage count, no accessory terminals and no wiring detail, so multi-stage and heat-pump owners are buying blind
Amazon Smart Thermostat review: what the specs say
Cheap, Honeywell-built and heavily rebated — but Alexa-only, and a C wire is required. At $79.99, Amazon's 2021 model sits among the cheapest we cover — the smart Thermostats we compare run from $79 to $259.99. It scores 4.5/10 overall, calculated from published specifications across 8 categories rather than from a subjective impression.
Its strongest showing is Value at 8.5/10 — what the money buys once accessories, adapters and sensors are added in. The weakest is C-Wire Freedom at 1.5/10, which is the trade-off to weigh before buying: if that is the specification you care about most, one of the alternatives below will serve you better.
Worth knowing before you buy: a C wire is a hard requirement and the adapter is not in the box — the real cost in a four-wire home is the thermostat plus an adapter; and alexa only. There is no Google Home, no Apple Home, no HomeKit and no Matter, so it is a dead end outside Amazon's ecosystem. Every specification on this page comes from Amazon's own documentation or a verified retail listing — where a figure is not published, the table says so rather than estimating it.
Specifications and price last verified . Report an error
Full Specifications
| System Voltage | Low voltage 24V — Amazon lists conventional forced air, heat pump and radiant boiler. It does not work with 110-240V systems |
| C-Wire Required | Yes, hard requirement. Every Amazon, Best Buy and utility-store listing is titled 'C-wire required' |
| Adapter / Power Kit Included | No — the C-Wire Power Adapter is a separate purchase, or you buy the bundle SKU instead of this one |
| Heating & Cooling Stages | Not published by Amazon. The listings say only 'most 24V heating and cooling systems (conventional forced air, heat pump, radiant boiler)' with no stage count anywhere — run Amazon's compatibility checker before buying |
| Heat Pump & Aux Heat | Listed as compatible with heat pumps. Amazon does not publish how it handles auxiliary or emergency heat |
| Humidifier / Ventilator Terminals | None published, and no humidifier, dehumidifier or ventilator control is advertised anywhere in the listing |
| Remote Sensors | No dedicated remote sensor exists for this thermostat. Best Buy's listing states comfort zones can use select Echo devices or the Amazon Smart Air Quality Monitor as temperature inputs instead |
| Occupancy Detection | None at the thermostat. Away behaviour comes entirely from Alexa Hunches |
| Matter Support | No |
| Voice & Smart Home Platforms | Amazon Alexa only. No Google Home, no Apple Home, no HomeKit, no SmartThings. The Alexa app is mandatory and most settings are not reachable on the thermostat screen at all |
| Utility Rebates & Demand Response | ENERGY STAR certified and one of the most heavily rebated thermostats in US utility marketplaces; several utilities bundle it into demand-response enrolment |
| Account or Subscription Needed | No subscription, but an Amazon account and the Alexa app are required and there is no web dashboard |
| Connectivity | Wi-Fi |
| Material | White plastic with a capacitive front panel; trim plate included |
| Warranty | 12 months |
Compare Amazon Smart Thermostat With
Cheaper Alternative
Sensi Lite (ST25) — $79.00
Premium Alternative
Google Nest Thermostat (2020) — $129.99