Updated October 2026
Data from Amazon and official Honeywell Home and Sonoff sites.
2026 verdict
Sonoff Thermostat Core is the more complete option versus Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat in 2026, helped most by price, warranty, and connectivity.
Its biggest wins come from price, warranty, and connectivity, and integrations add more confidence to the verdict. Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat is the better fit only for buyers who prioritize system health monitor above everything else here. For the average buyer, Sonoff Thermostat Core is the safer choice.
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| Feature | Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat | Sonoff Thermostat Core | Winner |
|---|---|---|---|
| Price | $123.49 | €39.90 | Sonoff Thermostat Core |
| Warranty | 1 year | 2 years | Sonoff Thermostat Core |
| Connectivity | 2.4 GHz WiFi | Bluetooth, Zigbee | Sonoff Thermostat Core |
| Integrations | Google Home, Alexa, Samsung SmartThings, Home Assistant | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter, External Temperature Sensors | Sonoff Thermostat Core |
| System Health Monitor | YES | NO | Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat |
| Screen | YES | YES | Tie |
| Sensors | Temperature, Humidity | Proximity / Motion, Temperature | Tie |
| Alerts | Temperature Alerts | Temperature Alerts | Tie |
| Energy Savings | YES | YES | Tie |
| Voice Control | YES | YES | Tie |
| Speaker | NO | NO | Tie |
31% OFF
$123.49
$179.99
- + System Health Monitor: YES
- - Price: $123.49 vs €39.90
- - Warranty: 1 year vs 2 years
Winner
€39.90
- + Price: €39.90
- + Warranty: 2 years
- + Connectivity: Bluetooth, Zigbee
- - System Health Monitor: NO vs YES
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.
- Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat
- Sonoff Thermostat Core
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Frequently Asked Questions
Which is better overall: Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat or Sonoff Thermostat Core?
Sonoff Thermostat Core has the stronger overall profile in this comparison, especially for price, warranty, and connectivity.
What is the biggest difference between Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat and Sonoff Thermostat Core?
Price is one of the clearest differences: Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat lists $123.49, while Sonoff Thermostat Core lists €39.90.
Which one looks better on price?
Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat is listed at $123.49, while Sonoff Thermostat Core is listed at €39.90. Sonoff Thermostat Core (better spec).
Who should buy Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat?
Choose Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat if your priority is system health monitor and that matters more than price.
Who should buy Sonoff Thermostat Core?
Choose Sonoff Thermostat Core if your priority is price and warranty and that matters more than system health monitor.
Full comparison table
Compare all 23 Thermostats side by side
You are looking at two of them. The full table lines up all Thermostats in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
- 23 Thermostats
- 51 specs compared
- 47 filters
CieloBreez Max
20% OFF
$114.44$91.40
SensiTouch smart thermostat
EcobeeSmart Thermostat Premium
SensiSmart thermostat
23% OFF$129.99$99.99
EcobeeSmart Thermostat Enhanced
18% OFF$199.99$164.99
GoogleNest Learning Thermostat (4th gen)
18% OFF$279.99$229.99
CieloBreez Eco
15% OFF$79.00$67.15- Honeywell Home
RTH9585WF Wi-Fi Smart Color Thermostat
31% OFF$179.99$123.49 
Honeywell HomeT9 Smart Thermostat
Honeywell HomeT5 Smart Thermostat
30% OFF$109.99$77.25
SensiTouch 2 smart thermostat
15% OFF$189.00$159.99
AmazonSmart Thermostat
24% OFF$119.16$91.07
Honeywell HomeX7S Smart Thermostat
$197.45
EcobeeSmart Thermostat Essential
21% OFF$139.99$109.99
Honeywell HomeX2S Smart Thermostat
26% OFF$84.99$62.99
GoogleNest Learning Thermostat
AqaraThermostat Hub W200
25% OFF$159.99$119.99
GoogleNest Thermostat
31% OFF$129.99$89.99
Honeywell HomeX8S Smart Thermostat
6% OFF$259.99$245.00
SensiLite smart thermostat
$62.99
- ThermostatsHoneywell Home
RTH9585WF Wi-Fi Smart Color Thermostat
4.3(20,106)31% OFF$179.99$123.49 - ThermostatsHoneywell Home
T5 Smart Thermostat
4.3(1,518)30% OFF$109.99$77.25 - ThermostatsHoneywell Home
T9 Smart Thermostat
4.3(2,980) - ThermostatsHoneywell Home
X2S Smart Thermostat
4.2(414)26% OFF$84.99$62.99 - ThermostatsHoneywell Home
X7S Smart Thermostat
4.3(82)$197.45 - ThermostatsHoneywell Home
X8S Smart Thermostat
4.1(153)6% OFF$259.99$245.00 
Water Leak SensorsHoneywell HomeL1 WiFi Water Leak and Freeze Detector
3.8(68)$68.00
Air Quality MonitorsSonoffSAWF-07P Air Quality Monitor
3.7(193)$39.90
Air Quality MonitorsSonoffSAWF-08P Air Quality Monitor
4.3(169)$49.90
CamerasSonoffCAM GlassView
4.4(30)20% OFF$34.90$27.92
CamerasSonoffCam Outdoor DUO
$79.90
CamerasSonoffCam Slim Gen2
4.4(176)$19.90
CamerasSonoffGK-200MP2-B
4.0(149)
DisplaysSonoffNSPanel Pro Gen2
3.4(11)€149.90
DisplaysSonoffNSPanel Pro
4.1(75)$129.90
DonglesSonoffDongle Lite MG21
4.5(452)$24.90
DonglesSonoffDongle Max
4.3(603)18% OFF€38.99€32.13
DonglesSonoffDongle Plus MG24
4.7(690)$35.90
DonglesSonoffDongle Plus PP10
4.6(99)$35.90
DonglesSonoffDongle-PZG23
4.6(175)$39.90
DonglesSonoffZ-Wave 800 PoE Dongle Max
4.5(26)$44.90
DonglesSonoffZBDongle-E
4.7(3,743)$24.90
DonglesSonoffZBDongle-P
4.6(5,678)16% OFF$39.99$33.47
Door & Window SensorsSonoffDW2-WIFI
3.8(1,058)
Door & Window SensorsSonoffSNZB-04 ZigBee Wireless Door/Window Sensor
3.7(101)
Door & Window SensorsSonoffSNZB-04P ZigBee Door/Window Sensor
4.0(13)
Door & Window SensorsSonoffSenseGuard DW Gen2
4.4(203)€40.91