Friday, October 05, 2007

Does lowering the thermostat at night mean that it takes more energy to reheat the house each morning?

According to the La Plata Electric Association, it is a myth that it takes as much energy to reheat a house in the morning as was saved during the temperature setback period overnight. The amount of heat a house loses through its walls, ceilings and floors is directly proportional to the difference between the indoor and the outdoor temperatures. Air leakage into and out of your house also increases with larger temperature differences.

When the indoor temperature is set lower, the indoor to outdoor temperature difference is smaller, so less heat is lost from your house. If less heat is lost, your furnace has to use less electricity to create the heat to replace it. The amount of heat used to reheat the house, therefore, is less than the amount saved over the temperature setback period.

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