Comment Smart heat pump thermostat (Score 1) 192
I have a heat pump, and would like a reasonably priced smart heat pump thermostat. I can't use a standard programmable thermostat since if I tell it to go down to go down to 60 at night, then 68 shortly before I get up it will flip into Auxiliary Mode (actually more likely bump all the way up to Emergency Mode) and use the MUCH less efficient electrical backup systems. Heat pumps alone can be pretty efficient but often MUCH more gradual, needing a fair bit of lead time.
A smart heat pump thermostat would probably need external sensors for the outdoor temperature, and maybe even add things like wind speed, ambient heat from direct sunlight vs overcast, etc to determine when to start up the heat pump and stay only in the most efficient heat pump mode yet still get to the desired temperature at the desired time. It would learn over time how differing outdoor conditions altered its efficiency and adjust accordingly.
I grew up with a gas furnace and we had a fairly inexpensive thermostat that could be programmed for 6 changes a day, with the ability to customize all 7 days individually if desired, or have one setting for M-F and another for Sat and one for Sun. You could manually make an adjustment and have it kick back into the programmed settings at the next programmed interval. I don't see much need for going beyond that for non-heat pump systems.