If you have a fan, turn it on. A ceiling fan or box fan creates a wind chill effect that makes you feel cooler at a higher temperature setting, as long as the humidity is not too high.
If you live in an area with moderate temperatures, you may not need your central air conditioning system all day and all night. Take advantage of the cooler nighttime temperatures by keeping the windows open. Close them first thing in the morning and keep your blinds and curtains drawn when it’s sunny outside to prevent the sun from heating up the house.
If you need the air conditioning at home, program it to turn on before you arrive or, on some thermostats, turn it on with a smartphone app.
If there is a heat wave, avoid using your washer, dryer, and dishwasher during the heat of the day. Also, make sure to use the exhaust fans in your kitchen when cooking or in the bathroom when showering.
Outdoor grilling is another way to keep the heat out of the house.