Jim: No central air conditioning here. They are in the basement where it gets pretty damp in the summer due to the stone wall foundation and lack of air movement. The bulb due shrink down a little but soon bulk up with water. It may be a good idea to give a sprinkle of water during the summer. Kind of like the old wine cellar. Winter is a bit different with the steam pipes from the heating system, even though insulated it gets warm. Arnold