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TeachMeFinance.com - explain Heating degree-days (HDD) Heating degree-days (HDD) The term 'Heating degree-days (HDD)' as it applies to the area of energy can be defined as ' A measure of how cold a location is over a period of time relative to a base temperature, most commonly specified as 65 degrees Fahrenheit. The measure is computed for each day by subtracting the average of the day's high and low temperatures from the base temperature (65 degrees), with negative values set equal to zero. Each day's heating degree-days are summed to create a heating degree-day measure for a specified reference period. Heating degree-days are used in energy analysis as an indicator of space heating energy requirements or use'. Previous 5 Terms: Heat sink Heat Stroke Heat Wave Heated floorspace Heating Degree Days Next 5 Terms: Heating equipment Heating intensity Heating stove burning wood, coal, or coke Heating value Heatup About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.