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What triggers a heat pump's auxiliary heat to come on?
I've searched all over and can't seem to find the answer to a simple question. What causes my heat pump's aux heat to come on? Mine is seemingly not working. Temps here in Phoenix got in to the low 30s last night. My thermostat is set to 70, but the house is 65.
The outside unit is running, but I think the problem is that the auxiliary electric heat is just not coming on for some reason. Funny thing is that our ancient Honeywell Chronotherm III thermostat does not have an indicator for aux heat. Everything I can find online about these thermostats suggest there is a heat pump version (with LED for aux/emergency heat) and one for standard systems. Can't image we've lived in this house for 16 years with a thermostat that's not compatible with a heat pump.
Does the interior thermostat trigger aux heat or does the outside unit have its own thermostat that triggers it? I don't want to go buy a new thermostat if that's not what's causing the problem.
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Lee
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