A/C on when furnace on
I was surprised to find that when connected to power, if I turn on the furnace the a/c fan also comes on. This was unexpected. I don't really like it. Can anyone explain this to me?
I have the Dometic digital thermostat controlling both the a/c and the furnace. Of course, I can just turn off the a/c breaker, but I'd just like to learn more about the purpose of the a/c fan coming on and what can be done about it. (Temps of 90's during day and 50's during night had me using both the a/c and furnace in same 24 hr period).