
Honeywell Home RTH9585WF1004
Score: 73/100
Amazon Smart Thermostat
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.

The Amazon Smart Thermostat is an ENERGY STAR-certified, Alexa-focused thermostat with auto-learning temperature control and a compact touch-sensitive display. Its main trade-offs are the mandatory C-wire and limited 2.4 GHz Wi-Fi with no built-in voice mic. Ideal for Alexa/Ring users seeking an affordable, easy-install solution.
| Attribute | ![]() | ![]() |
|---|---|---|
1 yearsbest | — | |
— | 0.9 inchbest | |
| ↓ lower better | 0.204 kg | 0.11 kgbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | ![]() | ![]() |
|---|---|---|
General(1) | ||
HVAC Compatibility | Forced air, hot water, steam, heat pumps | 24V |
Connectivity(1) | ||
Smart Home Integration | Alexa, Google Assistant, SmartThings, IFTTT | Alexa, Ring |
Power & Installation(1) | ||
Power Source | 24V | C‑wire (24V) |
Display(1) | ||
Display Type | Full-color touchscreen | Touch-sensitive |
Build & Design(2) | ||
Device Weight (kg) | 0.204 kg | 0.1095 kg |
Device Dimensions (H×W×D) (mm) | 22×114×89 mm mm | 21.4×90.4×90.4 mm mm |

Products in the top-left offer the best value (high score, low price).

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.

“Easy Alexa-guided install (even with new C-wire)”

“Heats to 68°F home, drops to 52°F away”




Professional reviewers consider the Amazon Smart Thermostat a strong value proposition, praising its auto-learning algorithm, tight Alexa integration, and broad 24V HVAC compatibility while noting its ecosystem constraints, mandatory C-wire, and limited connectivity as notable drawbacks.
Everyday users generally appreciate the straightforward Alexa-guided setup, reliable auto-scheduling, and remote app control that delivers noticeable energy savings, but they frequently cite the C-wire requirement and occasional cycling glitches as pain points.