It’s more efficient to leave your air conditioner running at a minimal level during the day than to shut it off and have to recool the house again later.
The less you use the AC, the less electricity you use. When the AC is running, regardless of the level, you are paying for it; when it is off, you’re not. Keep your windows closed while the AC is off to not let in additional humidity. A well insulated home should only drop a few degrees throughout the day, while you’re not home.
Myth:To cool off a house faster, you should crank the thermostat 57 degrees cooler than the desired temperature, until the house cools off.
Fact:Lowering the temperature on the thermostat does not make the air conditioner work any faster, when cooling off your home. An air conditioner extracts the hot air in a home and
replaces it with cold. An air conditioner only replaces a given amount of hot air with cold in a particular time frame.
Myth:Closing doors, vents and ductwork to unused rooms makes better and more efficient use of an air conditioner. Cold air goes where the heat is. If there is a hot, unused room, the air conditioner will work to cool it off. By closing that room off to the rest of the house (by register or by closing the ductwork leading to that room), your home will stay cooler more efficiently.
Fact:Opening the registers in all rooms, and leaving the interior doors open will circulate cold air throughout the house more efficiently.