degree day
Definition
Unit for estimating the demand for energy required for heating or cooling. In the US, the typical standard indoor temperature is 65úF (18.3úC). For each 1úF decrease or increase from this standard in the average outside temperature one heating or cooling degree day is recorded. For example, if the average outside temperature for a day was 60úF, it records as 5 heating degree days (HDD); if it was 70úF, it records as 5 cooling degree days (CDD).
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