Originally Posted by KC13
Thanks once again for your response. I found some info on the internet here Heating, Air Conditioning, Fridge, HVAC: Heat pump thermostat control, thermostat control, heater elements
And here Previous Question Index: Topics Starting with a
That made me start checking things more carefully.
When this cold spell hit, I raised the temperatures on my thermostat schedules. I have never done this before. Under the previous schedule, I had simply raised the temp manually on the thermostat to what I wanted when needed. Thinking back, this is when I typically saw the aux heat indicator show on the thermostat.
So I just manually raised the temperature from its current setting by a couple degrees and indeed the thermostat does show the aux heat indicator. For this reason, I am thinking that the aux heater does, in fact, work.
However, I am not sure about if it is working during the defrost cycle of the heat pump. I only found out recently that there was such a thing. I may never have noticed it before because it has never been this cold this long since I have been in this house with the heat pump. Maybe the heat pump only has to go through a defrost cycle when it is very cold. Or maybe it does it frequently but I have only noticed it now because the air being used right now is so very cold.
It has been suggested that one reason I am not seeing the aux heat indicator as frequently as before is that my Honeywell TH8000 thermostat is in recovery mode (which I have in fact seen for the first time since changing my schedules) and when in this mode, it may not ever call upon the aux heater. But I don't know if this will impact the use of aux heat during defrost or not.
Thanks for your time and responses. Happy holidays.