What are degree days?

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What are degree days?

Heating degree days and cooling degree days are used as a measure of the heating and cooling needs of buildings. Both are referenced to 65 degrees F. If the average of a given day's high and low temperature is 65 degrees, then there are no (zero) heating or cooling degree days. If the average temperature is 72 degrees F for a given day, then there are (72 minus 65 equals) 7 cooling degree days. If the average temperature is 50 degrees F., then there are (65 minus 50 equals) 15 heating degree days. You can add up the degree days for any time period, say the month of January, and get an idea of how much heating was required to heat buildings. The energy industry pays attention to heating and cooling degree days as a way to predict energy prices.

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