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Thermostats · Head to head

Amazon Smart Thermostat vs Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat

Full Smart Thermostats comparison in 2026

Updated September 2026
Data from Amazon and official Honeywell Home site.
2026 verdict
Homeowners who want a big, readable screen and more than Alexa are better off with the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat than the Amazon Smart Thermostat.
Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat
Winner
Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat
$123.49$179.9931% OFF
Buy on Amazon USACheck price
The Honeywell works with Google Home, Alexa, SmartThings and Home Assistant, reads humidity, sends extreme temperature alerts, reminds you about the filter and humidifier pad, and shows indoor and outdoor conditions on a customisable colour touchscreen. The Amazon Smart Thermostat is the cheaper, smaller unit, with Alexa as its only platform, a monochrome display without touch and a trim plate in the box. Both have a one year warranty, schedule automatically and use 2.4 GHz Wi-Fi, and neither supports Apple HomeKit or Matter. Choose the Amazon Smart Thermostat for basic Alexa control on a budget, and the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat for a fuller-featured wall unit.
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FeatureAmazon Smart ThermostatHoneywell Home RTH9585WF Wi-Fi Smart Color ThermostatWinner
Price$94.23$123.49Amazon Smart Thermostat
Included accessoriesTrim PlateNoneAmazon Smart Thermostat
IntegrationsAlexaGoogle Home, Alexa, Samsung SmartThings, Home AssistantHoneywell Home RTH9585WF Wi-Fi Smart Color Thermostat
SensorsTemperatureTemperature, HumidityHoneywell Home RTH9585WF Wi-Fi Smart Color Thermostat
AlertsNoneTemperature AlertsHoneywell Home RTH9585WF Wi-Fi Smart Color Thermostat
System Health MonitorNOYESHoneywell Home RTH9585WF Wi-Fi Smart Color Thermostat
Voice ControlNOYESHoneywell Home RTH9585WF Wi-Fi Smart Color Thermostat
Rating4.34.3Tie
Warranty1 year1 yearTie
Connectivity2.4 GHz WiFi2.4 GHz WiFiTie
ScreenYESYESTie
Energy SavingsYESYESTie

What the differences mean

Smart home platforms

The Amazon Smart Thermostat is controlled through Alexa only. The Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat adds Google Home, SmartThings and Home Assistant. Neither works with Apple HomeKit.

Screen

A full-colour touchscreen with indoor and outdoor readouts and a customisable background on the Honeywell, against a small monochrome LED display without touch on the Amazon model, which shows only the temperature.

Humidity and alerts

The Honeywell reads humidity and alerts you to extreme temperatures. The Amazon Smart Thermostat reads temperature only and sends no alerts.

Maintenance and energy reports

The Honeywell reminds you to change the filter and humidifier pad and sends monthly energy reports with personalised tips. The Amazon Smart Thermostat offers energy saving scheduling but no reminders or reports.

Size and trim plate

The Amazon Smart Thermostat is a compact 90 mm square with a trim plate included. The Honeywell is a larger rectangular unit.

Which one to buy if

What owners say

Owners of the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat keep returning to how long it lasts, with many describing it as the replacement that kept working after a Nest gave up. They like the colour screen they can match to the wall, the outdoor temperature and humidity readout, and being able to adjust it from the phone, the web portal or the unit itself, and several installed it in about five minutes. What they warn about is Resideo's cloud, which can knock out the app while the schedule keeps running, remote features that are effectively US-only, a fixed one-degree temperature swing and the need for a C wire.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • Amazon Smart Thermostat
  • Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat

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Frequently Asked Questions

Which is better: Amazon Smart Thermostat or Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat?

The Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat. It works with more platforms, reads humidity, sends alerts and filter reminders and has a colour touchscreen. The Amazon Smart Thermostat is the cheaper, Alexa-only option.

What is the biggest difference between the Amazon Smart Thermostat and the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat?

Platform support. The Amazon Smart Thermostat works with Alexa only, while the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat also works with Google Home, SmartThings and Home Assistant.

Do either of them work with Apple Home?

No. Neither the Amazon Smart Thermostat nor the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat supports Apple HomeKit or Matter.

Is the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat reliable?

Owners of the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat praise its longevity, but note that remote control depends on Resideo's cloud, which can go down while the thermostat keeps running its schedule.

Who should buy the Amazon Smart Thermostat?

Alexa-only homes replacing a basic thermostat on a tight budget, where a compact unit and a trim plate in the box matter.

Who should buy the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat?

Google Home, SmartThings or Home Assistant households that want a large colour screen, humidity readings and maintenance reminders.

Full comparison table

Compare all 22 Thermostats side by side

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