- Direct sunlight falling on a window air conditioning unit increases its workload. When a choice is possible, locate such units on the north or shady side of the house.
- Set the cooling thermostat as high as comfort will permit. The higher the setting, the more energy you will save.
- Close cooling vents and turn off window air conditioners in unused rooms. Keep doors to unused rooms closed.
- Draw blinds, shades, or drapes to block the sunlight during the hottest part of the day, especially on south- and west-facing windows. Exterior shading, such as trees or awnings, are the most effective, but interior shading will help.
- Position heat-producing devices, such as lamps and TV sets, away from your central cooling system's wall-mounted thermostat. Heat rising from the equipment could cause the thermostat to read a temperature higher than the true room temperature and lead to overcooling.
- Complete heat- and/or steam-producing activities after 8 p.m. or before 8 a.m. to reduce the load on your AC. These include laundry, dishwashing, cooking, and showers or baths.