Emerson Sensi ST55
Score: 72/100
Honeywell Home RTH9585WF1004
Score: 73/100Rankings
Honeywell Home RTH9585WF1004 offers a sleek full-color touchscreen and supports both Alexa and Google Assistant, backed by ENERGY STAR certification. It requires a C-wire and can suffer from temperature accuracy and occasional app glitches. Best suited for homeowners wanting a customizable display and multi-assistant integration at a moderate price.
Emerson Sensi ST55 provides a 5-inch LED touchscreen, broad smart-home compatibility, and geofencing-driven energy savings, all at an affordable price. Limitations include the need for a C-wire, 2.4 GHz-only Wi-Fi, and lack of built-in room sensors. Ideal for DIY homeowners seeking a versatile, budget-friendly thermostat.
| Attribute | | |
|---|---|---|
3 yearsbest | 1 years | |
5 inchbest | — | |
| ↓ lower better | 0.386 kg | 0.204 kgbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
General(2) | ||
HVAC Compatibility | Various (single to multi-stage) | Forced air, hot water, steam, heat pumps |
Warranty (years) | 3 years | 1 years |
Connectivity(1) | ||
Smart Home Integration | Alexa, Google Assistant, Apple HomeKit, Samsung SmartThings | Alexa, Google Assistant, SmartThings, IFTTT |
Power & Installation(1) | ||
Power Source | 20-30 VAC | 24V |
Display(1) | ||
Display Type | LED touchscreen | Full-color touchscreen |
Build & Design(2) | ||
Device Weight (kg) | 0.386 kg | 0.204 kg |
Device Dimensions (H×W×D) (mm) | 25.4×149.35×95.25 mm mm | 22×114×89 mm mm |
Products in the top-left offer the best value (high score, low price).
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.
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.
Professional reviewers commend the Honeywell RTH9585WF1004 for its stylish, full-color display, easy integration with Alexa and Google Assistant, and its Smart Response learning that simplifies scheduling. They also highlight its ENERGY STAR rating and Demand Response capability as strong points for energy-conscious buyers, while noting its reliance on a C-wire as a potential limitation.
Everyday users appreciate the intuitive touchscreen, quick setup, reliable Wi-Fi control, and attractive customizable design. Common praise centers on energy-usage reports and voice-control convenience, whereas recurring complaints involve temperature accuracy, small size, occasional touchscreen lag, app instability, and Wi-Fi connectivity issues.
