I have two heat pumps with one controlled by a 3rd gen learning thermostat and the other by a 4th gen learning stat. I have a gas fired baseboard system with five zones controlled by Nest E thermostats that provide auxiliary heat when the heat pumps cannot maintain desired comfort settings. I am told that I can manually set a lockout temperature for the heat pumps when the temperature goes below a point where they are not efficient for heating. This is supposed to be available in the Equipment setting, but when I go there, I cannot find any option to set a lockout temp. I see that some how during setup of the heat pump thermostats, the System details for the Heating systems are not correct. The heat pump orientation is O, heat source is Elect, Heat type is forced air, but the Heating system 2 is set as source - electric, type forced air, heat type 2 forced air. in both learning thermostats. How do I tell these thermostats that when the outside temperature is below 30 degrees, they should not operate?
Several community members have a similar problem with having a separate heating system controlled by separate thermostats to provide backup heat and I have not seen a solution for this problem. I believe this problem is best solved with a software update using the fact that the thermostat knows what the outside temperature is, and should allow a temperature setting below which the heat pump is locked out from running.
