The easiest apple to pick from the save energy tree is your heating bill and thermostat setting. Just over half of the average U.S. home's energy use goes on space heating and air conditioning. In summer and warm conditions, the Department of Energy (DOE) recommends setting your thermostat to 85-90 degrees Fahrenheit (29.4 to 32.2 Celsius) to reduce cooling costs. In the right conditions, you could even turn it off. If you leave the thermostat at a higher setting, there's a risk of humidity affecting electrical equipment, furniture, and wood floors. Temperature-sensitive appliances like refrigerators have to work harder in warmer conditions and will consume more energy.