A programmable thermostat works fine with a heat pump. Just remember that a heat pump does not heat as fast as a furnace because of the lower BTU ratings so do not set the thermostat as far back as you normally would.
Also make sure to buy a thermostat that has heat pump terminals.
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A thermostat does nothing to prevent the loss of heat. That's the job of insulation. All the thermostat knows is to turn the heater on when the temperature drops below some number.
Thermostat
Look at the directions again and swap the wires you hooked up that are for the temp output, you have them switched
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thermostat is commonly used to regulate the heat of a furnace. It can programmed to maintain a desired temperature by turning the furnace on or off as needed. Some thermostats have additional features such WiFi connectivity, smart home integration, and scheduling options.