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HDD

HDD or Heating Degree Day, is a unit used for estimating /modeling the energy needed to heat a building. The standard practice is to subtract the average daily temprature from 65° (a day with an average temprature of 45 would equal 20). The annual HDD combines all the days with an average temperature below 65°.

WP Glossary Term Usage

  • Say what… aka the acronym dilemma
  • GDD
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November 21, 2012 By SLS

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    HDD or Heating Degree Day, is a unit used for estimating /modeling the energy needed to heat a building. The standard practice is to subtract the average daily temprature from 65° (a day with an average temprature of 45 would equal 20). The annual HDD combines all the days with an average temperature below 65°. WP Glossary […]

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