I got a new digital thermostat since the last time I had the air on, and I can't remember the setting for cool air. For heat this winter, I had the fan on auto. I just set the cool air temperatures, and with the fan on auto, it wasn't kicking on. When I turned the fan to on, it did kick on. Should the fan be on On or Auto? Just want to make sure I have it set correctly. I'm going to at least let it cool down to the temp setting I have and see what it does after that. Hated to turn the air on, but my black lab acts like she is about to die.