Until I get a contractor over here by the end of this week hopefully, I'm using the emergency heat. It's working just fine, but I don't know why it was saying "Aux Heat On" when there was a large temperature differential while now that it is a 2 degree differential, it is just saying "Heat On." Is it just automatic by the thermostat? The air coming out of the registers is warm, but not as warm as it was as far as I can tell.. I'm thinking it's just the thermostat displaying that depending on the temperature differential and it means nothing, but that doesn't explain the apparent difference in air temperature coming out of the registers. Before: ~95 degrees and now: ~78 degrees. Staging? Thanks in advance.