Will a Honeywell RTH6300B1056 programmable thermostat work with a Heat pump?

Read page 6. It depends upon how many wires you system has and what they are exactly used for.

http://customer.honeywell.com/techli...0s/69-1717.pdf

I answered this for you once before and told you it will not work on two stage heat.

My previous message and your thread.

https://www.askmehelpdesk.com/heatin...tml#post897949


You have 2 stage heat. Second stage is the electric or gas furnace and the first stage is for the heat pump.