heating degree days

Synonyms

HDD

Definition

An annual measure of the extent to which daily temperatures suggest that buildings may require some form of space heating, based on the daily temperature being below a certain threshold (15.5ºC). (UKCIP)

An annual measure of the extent to which daily temperatures suggest that buildings may require some form of space heating, based on the daily temperature being below a certain threshold (15.5�C). (UKCIP)

Wikipedia definition:

Heating degree day (HDD) is a measurement designed to measure 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. A similar measurement, cooling degree day (CDD), reflects the amount of energy used to cool a home or business.

Source: Wikipedia - Heating degree day