
Emerson
The Emerson Sensi ST55 Smart Thermostat is a Wi‑Fi‑enabled, 5‑inch LED touchscreen thermostat that offers DIY installation in about 30 minutes, broad smart‑home compatibility, and up to 23% energy savings through scheduling and geofencing.
Pros
Current
$98.95
Average
$88.34
Lowest
$42.95
Highest
$126.48
Lower = better sales rank
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Cons
From Expert Reviews
Praised by Experts
Criticized by Experts
From User Reviews
Users Love
Users Complain About
Expert Opinion
Professional reviewers commend the Sensi ST55 for its straightforward DIY installation, ENERGY STAR efficiency and the claimed 23% energy savings, as well as its compliance with Title 24 and robust smart‑home integration. However, they point out the need for a c‑wire to unlock full functionality and the limitation to a 2.4 GHz Wi‑Fi band, which places it behind higher‑end competitors.
What Users Say
Homeowners and renters alike praise the thermostat’s quick setup, remote app control, energy‑saving reports, and reliable fan circulation. Recurring complaints focus on occasional Wi‑Fi drops, the necessity of a c‑wire for some systems, and the lack of a built‑in room sensor or precise humidity control.
Common Complaints
Frequent Wi‑Fi connectivity drops, mandatory c‑wire for full feature set, absence of built‑in room sensor, and occasional imprecision in humidity control.
How It Compares
vs. Nest Learning Thermostat
Advantages
Disadvantages
Choose Nest if you want automatic learning and premium design and don’t need HomeKit.
vs. Ecobee SmartThermostat
Advantages
Disadvantages
Pick Ecobee when you need multi‑room sensing and voice assistant integration.
vs. Sensi Touch 2
Advantages
Disadvantages
Select Sensi Touch 2 if you want a touchscreen and extra stages but can afford the extra cost.