In our TH, if I am on shore power, when I turn on the heat, the A/C fan comes on. It is loud, and since we do not have a heat strip, it blows cold air. I understand the concept, but it is not comfor...
You should have three settings on thermostat, "Low - High - Auto". If it is in either the Low or High setting the A/C fan will run whenever the furnace is on. In the auto setting the A/C fan will not turn on with the furnace. Hope this helps.....