We just converted our gas furnaces to heat pumps (electrify everything, baby!). The installers took out two Honeywell thermostats and replaced them with the correct ones for the new equipment. if you can use these, they're all yours. They worked well for 11 years. If you replace the batteries and figure out how to extend the leads (which the guys cut) they could work well for another 11 years.
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Two Honeywell thermostats (Burlingame, CA)
This offer has been gifted to someone and is no longer available.