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What are heating and cooling degree days?

Heating Degree Days (HDD) and Cooling Degree Days (CDD) are a measurement designed to quantify the demand for energy needed to heat or cool a building. Generally, a Heating Degree Day is counted when that day’s average temperature is below 65 degrees Fahrenheit, which is the temperature below which buildings need to be heated. A Cooling Degree Day is generally counted when the average temperature is above 65 degrees Fahrenheit which is when the building would need to be cooled.

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