We don't have central air, either. However, I cannot imagine not running it when I'm not at home. That's a totally foreign concept to me. I turn it on in April, and it stays on through the end of October. I keep my humidor in a room with a north-facing window, that has both an air conditioning unit and a fan in the room. It just worked out that way for me.

There are alternatives for building coolerdors that will keep your smokes at a cooler temperature. Search for them in this forum.

Welcome from Hell.