HDD
Heating Degree Days- A form of degree day used to estimate energy requirements for heating. Typically, heating degree days are calculated as how much colder the mean temperature at a location is than 65F on a given day. For example, if a location experiences a mean temperature of 55F on a certain day, there were 10 HDD (Heating Degree Days) that day because 65 - 55 = 10.

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