"I'm still using ASHP for my heating until I get my project done. When the winter temp takes a nose dive, I 'circle the wagons'. I reduce the area of the house that needs to be heated by the heat pump. I also fill in with some gas heat from the kitchen stove for now... but I recently bought a small direct vent NG gas heater for that purpose. Now that my kitchen is much tighter, heating even a little bit with the gas stove is not a good choice.
I found that out with my CO2 monitoring project."
Be sure you are also monitoring CO as well as that will be more important than CO2 monitoring.
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