Honeywell Home RTH6580WF Wi-Fi 7-Day Programmable Thermostat (White) vs Honeywell Home T9 Smart Thermostat with 1 Room Sensor RCHT9610WFSW2003
These are side-by-side facts taken from each product guide: published specifications, strengths and caveats as their sources state them. This page is not a test, a ranking or a verdict about which model is better.
Check Honeywell Home RTH6580WF Wi-Fi 7-Day Programmable Thermostat (White) on AmazonCheck Honeywell Home T9 Smart Thermostat with 1 Room Sensor RCHT9610WFSW2003 on Amazon
Honeywell Home RTH6580WF Wi-Fi 7-Day Programmable Thermostat (White)
24 VAC forced-air, hydronic or heat pump systems that already have a C wire
A Wi-Fi thermostat with a backlit LCD and four schedule periods a day. Honeywell's guides say a C wire is mandatory and that it will not run millivolt or 120/240 V baseboard systems. Setup joins a 2.4 GHz network through a browser page, remote control runs through Total Connect Comfort, and the warranty is one year.
Published specifications
- Maker: up to 2 heat/2 cool conventional; up to 3 heat/2 cool heat pump
- Guides: C wire required, primary power; 24 V systems only, no millivolt or 120/240 V
- Maker: Wi-Fi 802.11 b/g/n, 2.4 GHz; Total Connect Comfort app; Alexa, Google Assistant
- Guide: 7-day schedule, 4 periods a day; temporary and permanent hold; Smart Response
- Maker: 3.5 x 5.75 x 1.5 in; backlit LCD; accuracy +/- 1°F
- Guide and maker: 1-year limited warranty
Strengths
- Maker lists up to 2H/2C conventional and 3H/2C heat pump staging
- Guide says it keeps running your system with or without Wi-Fi
- Maker page, listing and guide agree on the box contents
Caveats
- C wire is mandatory: without it the thermostat will not power up
- Listing shows 2 AA batteries and a Honeywell Home app; maker documents do not
- One-year warranty; removal and reinstallation costs not covered
Read the full Honeywell Home RTH6580WF Wi-Fi 7-Day Programmable Thermostat (White) guide
Honeywell Home T9 Smart Thermostat with 1 Room Sensor RCHT9610WFSW2003
24 VAC systems up to 3 heat/2 cool where room-by-room sensing appeals
A Wi-Fi touchscreen thermostat with one wireless room sensor for temperature, humidity and occupancy, and support for up to 20. A C wire is needed, and the kit includes a C-wire adapter if you lack one. It does not run baseboard or millivolt systems. Two-year limited warranty.
Published specifications
- Maker: up to 3 heat/2 cool; heat, cool, auto, off, emergency heat
- Guide: C wire needed for 24 VAC; C-wire adapter provided if you lack one
- Guide: no electric baseboard (120-240 V), no millivolt, no S terminals
- Guide: up to 20 sensors, up to 200 ft range; Active Rooms or selected rooms
- Maker: 4.92 x 3.7 x 0.94 in; Wi-Fi 2.4 and 5 GHz; 7-day programming
- Guide, maker, listing: 2-year limited warranty (guide: battery excluded)
Strengths
- C-wire adapter is in the box, per the maker page and guide
- Room priority can follow selected rooms or rooms with motion
- Two-year limited warranty agreed by all three sources
Caveats
- Adapter fitting is more complicated on zoned systems, per the guide
- No millivolt or line-voltage baseboard support
- Honeywell's page labels this kit discontinued
Read the full Honeywell Home T9 Smart Thermostat with 1 Room Sensor RCHT9610WFSW2003 guide
How to choose between them
Choose the Honeywell Home RTH6580WF Wi-Fi 7-Day Programmable Thermostat (White) if your situation matches: 24 VAC forced-air, hydronic or heat pump systems that already have a C wire. Its main caveat: C wire is mandatory: without it the thermostat will not power up.
Choose the Honeywell Home T9 Smart Thermostat with 1 Room Sensor RCHT9610WFSW2003 if your situation matches: 24 VAC systems up to 3 heat/2 cool where room-by-room sensing appeals. Its main caveat: Adapter fitting is more complicated on zoned systems, per the guide.
Both entries repeat what each guide records. Confirm the model, included parts and availability on the current listing before ordering.
Primary sources
- Honeywell Home product page and specifications, WiFi 7-Day Programmable Thermostat RTH6580WF1001/U1 Source for Honeywell Home RTH6580WF Wi-Fi 7-Day Programmable Thermostat (White)
- Honeywell Home User Guide 69-2715EF-07, RTH6500WF Smart Series RTH65801006 (listing-supplied PDF) Source for Honeywell Home RTH6580WF Wi-Fi 7-Day Programmable Thermostat (White)
- Honeywell Home Quick Start Guide, RTH6500WF Wi-Fi Series (listing-supplied PDF) Source for Honeywell Home RTH6580WF Wi-Fi 7-Day Programmable Thermostat (White)
- Honeywell Home T9 Smart Thermostat product page and specifications (SKU RCHT9610WFSW2003/U) Source for Honeywell Home T9 Smart Thermostat with 1 Room Sensor RCHT9610WFSW2003
- Honeywell Home T9 Thermostat Installation Guide 33-00421EF-01 (listing-supplied PDF) Source for Honeywell Home T9 Smart Thermostat with 1 Room Sensor RCHT9610WFSW2003
- Wireless Room Sensors for T9 and T10 Pro Quick Start Guide 33-00429EFS-01 (listing-supplied PDF) Source for Honeywell Home T9 Smart Thermostat with 1 Room Sensor RCHT9610WFSW2003
Primary sources checked .