Heating degree days and cooling degree days

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by Evan Stewart

WVEC.com

Posted on March 10, 2010 at 5:40 PM

Heating Degree Days are a measure of the coldness of the weather.

They are calculated by taking the average temperature on a given day and subtracting it from 65°.

Each degree the average daily temperature falls below 65° is a heating degree day.

Cooling degree days are also based on the day's average minus 65°. They relate the day's temperature to the energy demands of air conditioning.

For example, if the day's high is 90° and the day's low is 70°, the day's average is 80°. 80° minus 65° is 15 cooling degree days.

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