Energy Department Advises 78-Degree Summer Thermostat Setting

U.S. Department of Energy states that homeowners can reduce annual heating and cooling expenses by up to 10 percent by adjusting thermostats seven to ten degrees for eight hours each day. The agency advises maintaining indoor temperatures that remain comfortable while limiting the gap between indoor and outdoor readings.

Several energy companies, including Constellation, National Grid, and Carrier, list 78 degrees Fahrenheit as the recommended average setting.

The Department of Energy recommends raising the thermostat above the normal setting during extended absences. Programmable units can begin cooling before residents return.

Ceiling fans should operate counterclockwise in occupied rooms and be switched off when rooms are empty. The Department of Energy notes that fans create a wind-chill effect for occupants rather than lowering room temperatures. Homeowners are encouraged to vacuum intake vents, keep outdoor units clear of obstructions by at least two feet, and seal air leaks around doors and windows.

The agency also suggests using LED bulbs and avoiding placement of electronics near thermostats.

Window coverings can reduce daytime heat gain.

Full loads of dishes and laundry improve appliance efficiency. At night, when outdoor temperatures drop, residents may open windows and later close them to retain cooler air inside.