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Degree Day Information

What are Heating Degree Day's (HDD's)?

Heating degree days are indicators of household energy consumption for space heating. It was found that for an average outdoor temperature of 65 degree Fahrenheit, most buildings require heat to maintain a 70 degree temperature inside. The higher number of HDD's indicates more energy is required for space heating.


How heating and cooling degree days are computed?

Take the high and low temperature for the day, and average them. If this number is greater than 65 degree Fahrenheit, then we have (Average temperature - 65) cooling degree days. If the average temperature is less than 65 degrees, then we have (65 - Average temperature) heating degree days. Running totals of HDD's are kept so energy suppliers and consumers can assess energy requirements.

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