Unplug devices - Be sure to not only turn off but unplug your computer, television, and other devices that can drain power even when they’re not on. If that’s a hassle, consider buying a Smart Strip, which automatically cuts power when devices don’t need it.

Use fans - Overhead fans get air circulating, which means you might be able to delay turning on the air conditioning—especially if you can also leave windows open on cool summer evenings.

Close doors and vents - If you plan to spend your evening in the family room, there’s no reason to waste energy cooling the basement or guest room as well. Shut doors and shut vents to close off areas of the house you’re not using.

Add insulation - Homes often leak cool air during the summer (and warm air in the winter) because of spaces in between walls. Fill these gaps with insulation; Squirting spray foam into drilled holes in the wall might do the trick.

Turn off lights - In addition to remembering to flick off switches when you’re not using rooms, consider starting a summer tradition of candlelit dinners or dimly-lit game nights. During the day, try relying on natural light alone.

Get your AC inspected - Inspectors can make sure your system is leak-free and operating as efficiently as possible. Don’t forget to clean air filters; some units require monthly cleanings.

Turn it off - If you spend most of your day outside of the house, set your thermostat to automatically adjust the AC a few degrees up, when you’re away. To keep the sun from heating your rooms, close the blinds when you’re not home.

Hang laundry outside - Take advantage of the late sunset and warm evenings to bypass your dryer and let your clothes air-dry. Dryers are often the biggest energy sap in homes, after refrigerators.

Use the shade - If your home is in the shade, it will take less energy to cool down. If trees aren’t already doing the job, consider planting some as part of a long-term strategy for energy reduction.

Ban oven use - Using your oven to roast vegetables or heat up dinner makes your AC work overtime. Try to make more salads and other cold food in the summer, or use the toaster oven for small portions.