Winner
Updated November 2026
Data from the official Ecobee and Honeywell Home sites.
2026 verdict
Mounted in a hallway far from the bedrooms, the Ecobee Smart Thermostat Premium beats the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat because its included SmartSensor reads the rooms you actually use.
It also detects occupancy, measures CO2 and TVOC with air quality alerts, has a built-in speaker for voice control, works with Apple Home and dual-band Wi-Fi, and carries a three-year warranty against one. The Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat is the cheaper option and adds a system health monitor and schedule suggestions, and its owners value it for simply lasting, but it supports no remote sensors or Apple Home. Neither supports Matter. Choose the Ecobee Smart Thermostat Premium for multi-room comfort in an Apple, Google or Alexa home, and the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat for a reliable, budget colour touchscreen in a single-zone Alexa or Google home.
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| Feature | Ecobee Smart Thermostat Premium | Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat | Winner |
|---|---|---|---|
| Warranty | 3 years | 1 year | Ecobee Smart Thermostat Premium |
| Included accessories | Trim Plate, Temperature Sensor | None | Ecobee Smart Thermostat Premium |
| Connectivity | 2.4 GHz WiFi, 5 GHz WiFi, Bluetooth | 2.4 GHz WiFi | Ecobee Smart Thermostat Premium |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, External Temperature Sensors | Google Home, Alexa, Samsung SmartThings, Home Assistant | Ecobee Smart Thermostat Premium |
| Sensors | Proximity / Motion, Occupancy, Temperature, Humidity, TVOC, CO₂ | Temperature, Humidity | Ecobee Smart Thermostat Premium |
| Alerts | Temperature Alerts, Air Quality Alerts, Fire Alerts, Intrude Alerts | Temperature Alerts | Ecobee Smart Thermostat Premium |
| System Health Monitor | NO | YES | Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat |
| Speaker | YES | NO | Ecobee Smart Thermostat Premium |
| Local Control | YES | NO | Ecobee Smart Thermostat Premium |
| Rating | 4.3 | 4.3 | Tie |
| Power | C-Wire Required | None | Tie |
| Screen | YES | YES | Tie |
What the differences mean
Remote sensor
The Ecobee Smart Thermostat Premium ships with a SmartSensor and can follow whichever room is occupied. The Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat supports no remote sensors, so it heats and cools to the temperature at the wall.
Air quality
The Ecobee measures CO2 and TVOC and can alert you when the air gets stale. The Honeywell reads temperature and humidity only.
Apple Home and Wi-Fi
The Ecobee Smart Thermostat Premium works with Apple Home and joins 2.4 or 5 GHz Wi-Fi. The Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat has no Apple Home support and is 2.4 GHz only. Both work with Google Home, Alexa, SmartThings and Home Assistant.
Voice and speaker
The Ecobee has a built-in speaker, so you can talk to the thermostat itself. The Honeywell is voice controlled through a separate smart speaker.
Warranty
Three years on the Ecobee Smart Thermostat Premium against one year on the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat, a gap that adds weight to the pricier thermostat.
Which one to buy if
- upstairs and downstairs never feel the same
The Ecobee Smart Thermostat Premium includes a room sensor to even them out; the Honeywell cannot use one.
- your household uses iPhones and Apple Home
The Ecobee works with Apple Home and the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat does not.
- you want a dependable colour touchscreen for one zone at a lower cost
Owners of the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat stress how long it keeps working, and it costs less.
- stuffy air in a closed-up house worries you
Only the Ecobee Smart Thermostat Premium measures CO2 and TVOC and sends air quality alerts.
Winner
7% OFF
$242.48
$259.99
- + Warranty: 3 years
- + Included accessories: Trim Plate, Temperature Sensor
- + Connectivity: 2.4 GHz WiFi, 5 GHz WiFi, Bluetooth
- - System Health Monitor: NO vs YES
- + System Health Monitor: YES
- - Warranty: 1 year vs 3 years
- - Included accessories: None vs Trim Plate, Temperature Sensor
What owners say
Owners of both thermostats praise a screen they enjoy looking at and an app they use to adjust the house from anywhere. Ecobee Smart Thermostat Premium owners single out the SmartSensor in the box, which finally balances a bedroom against the hallway, and schedules that learn their routine and cut how often the system cycles; their complaints are installs in older homes that needed extra wiring or an electrician, readings thrown off by a nearby vent, and occasional app glitches. Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat owners talk most about reliability, many having replaced smart thermostats that failed within a year or two, and about the outdoor temperature and humidity readout; they complain that the app stops working when Resideo's servers have a bad day and that remote control is effectively limited to North America.
Frequently Asked Questions
Ecobee vs Honeywell: which is better, the Ecobee Smart Thermostat Premium or the Honeywell Home RTH9585WF?
The Ecobee Smart Thermostat Premium. It includes a remote SmartSensor, occupancy and air quality sensing, a built-in speaker, Apple Home support and a three-year warranty. The Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat is cheaper and well regarded for reliability, but it cannot use room sensors.
What is the biggest difference between the Ecobee Smart Thermostat Premium and the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat?
Room sensing. The Ecobee ships with a SmartSensor and balances temperatures across rooms by occupancy, while the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat reads only the temperature and humidity at the wall.
Is the Honeywell Home RTH9585WF still a good thermostat?
For a single zone, yes. Owners of the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat praise its long-term reliability, customisable colour touchscreen and outdoor readouts, but note that remote control depends on Resideo's cloud, a C wire is required, and the warranty is one year.
Do the Ecobee Premium and the Honeywell RTH9585WF support Matter?
No. Neither the Ecobee Smart Thermostat Premium nor the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat supports Matter. Both work with Google Home, Alexa, SmartThings and Home Assistant, and only the Ecobee works with Apple Home.
Who should buy the Ecobee Smart Thermostat Premium?
Homes with uneven rooms, Apple Home households and anyone who wants air quality readings and a thermostat that responds to voice on its own.
Who should buy the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat?
North American buyers with a C wire who want a reliable, customisable colour touchscreen for a single zone, with Alexa or Google Home control, at a lower price.
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