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Heating degree day
Sum of temperature values / From Wikipedia, the free encyclopedia
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Heating degree day (HDD) is a measurement designed to quantify the demand for energy needed to heat a building. HDD is derived from measurements of outside air temperature. The heating requirements for a given building at a specific location are considered to be directly proportional to the number of HDD at that location.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/United_States_Heating_Degree_Day_map%2C_1961-1990.jpg/640px-United_States_Heating_Degree_Day_map%2C_1961-1990.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6c/United_States_Cooling_Degree_Day_map%2C_1961-1990.jpg/640px-United_States_Cooling_Degree_Day_map%2C_1961-1990.jpg)
Related measurements include the cooling degree day (CDD), which quantifies demand for air conditioning.