The number of heating degree days per year reflects the amount of energy people use to heat buildings during the cool season. 
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For example, many people like to keep indoor temperatures at 65°F. On a day when the average outdoor temperature is 55°F, raising the indoor temperature by 10 degrees over 1 day requires 10 degrees of heating multiplied by 1 day, or 10 heating degree days. Utility companies use heating degree days to estimate the annual amount of energy people will use to heat buildings. 
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For more information, visit https://crt-climate-explorer.nemac.org
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