His suggestion for your air conditioning needs: Add four degrees to the temperature you normally set for your house while you're on summer vacation. So, if you normally set it to 73, bump it up to 77 degrees.
But don’t get greedy. If you set the thermostat too high, you might find your own temperature rising when you see your next electricity bill.
“Four degrees is the sweet spot,” Brookover says. “More than that and you may spend what you save trying to cool it back down.”
Brookover cautions there’s an even bigger threat from leaving your house too warm. “You could damage wall compounds in Sheetrock if it’s too hot and humid in the house,” he says.
Excessive humidity also could lead to mildew in the house, and Brookover says he’s even seen refrigerators sweating when the house is too hot and humid. So you do want to keep your A/C running at a reasonable pace.