Honeywell Home RTH6580WF Wi-Fi 7-Day Programmable Thermostat (White) vs Sensi Lite Smart Thermostat ST25 (Black)
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 Sensi Lite Smart Thermostat ST25 (Black) 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
Sensi Lite Smart Thermostat ST25 (Black)
Single-stage or one-extra-stage 24 VAC systems on a 2.4 GHz network
Copeland's Sensi Lite thermostat, confirmed by matching UPC. It handles 1H/1C, 1H/2C or 2H/1C conventional systems and 2H/1C heat pumps. Copeland and the listing agree that heat-only, cool-only and heat pump systems need a C wire. Setup requires the Sensi app and an account; the warranty is three years for DIY or pro installs.
Published specifications
- Maker: stages 1H/1C, 1H/2C or 2H/1C conventional; heat pump 2H/1C; 3-wire zone heat
- Maker and listing: C wire required for heat-only, cool-only and heat pump systems
- Maker: 24 VAC, 20-30 Vac rating; hardwire with power stealing; 2 x AAA included
- Guide: Wi-Fi 2.4 GHz only; Sensi app and account required; Alexa, Google Assistant, SmartThings
- Maker: 5.07 x 3.13 x 0.88 in; 7-day schedule, 8 periods a day; geofencing; keypad lockout
- Maker warranty table: 3 years, DIY or professional install
Strengths
- Listing and maker agree on exactly which systems need a C wire
- Three-year warranty applies whether you or a contractor installs it
- UPC matches Copeland's product page, which publishes a specification block
Caveats
- Only one extra stage: no 2H/2C, and no two-stage heat pump support
- Heat pump, heat-only and cool-only systems need a C wire
- Requires the Sensi app, an account and a 2.4 GHz network to set up
Read the full Sensi Lite Smart Thermostat ST25 (Black) 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 Sensi Lite Smart Thermostat ST25 (Black) if your situation matches: Single-stage or one-extra-stage 24 VAC systems on a 2.4 GHz network. Its main caveat: Only one extra stage: no 2H/2C, and no two-stage heat pump support.
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)
- Copeland product page and specifications for Sensi Lite Smart Thermostat ST25 Source for Sensi Lite Smart Thermostat ST25 (Black)
- Sensi Lite installation guide R-5664 (ST25 series) supplied with the Amazon listing Source for Sensi Lite Smart Thermostat ST25 (Black)
- Copeland Sensi warranty table by model Source for Sensi Lite Smart Thermostat ST25 (Black)
Primary sources checked .