Emerson Sensi Smart Thermostat
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Runs on AA batteries — no C-wire required. Fastest install at 18 minutes in our test. Works with Alexa, Google Assistant, and Apple HomeKit.
BBest for Older Homes
Best for no-C-wire homes — battery powered, 18-min install.
The Emerson Sensi is the only model here that runs fully on AA batteries, making it the go-to for homes without a C-wire that can't run new wiring. An install of under twenty minutes is the fastest here, and the on-device schedule editor is clear enough to skip the app entirely. Lacks learning algorithms — you set the schedule manually.
Pros
- Runs on AA batteries — no C-wire needed
- Fastest install: 18 minutes
- Works with all major voice assistants
Cons
- No self-learning — manual schedule setup required
Score breakdown
Energy savings3.5
Ease of install5.0
App quality3.5
Value4.5
Sensi Smart Thermostat Review ST55
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