Degree-day
A degree-day is a measurement used in HVAC and energy analysis to estimate the demand for heating or cooling a building. It is calculated based on the difference between a base temperature—commonly 65 degrees Fahrenheit—and the average outdoor temperature for a day. For heating, degree-days are calculated when the outdoor temperature is below 65°F, and for cooling, they are calculated when the temperature is above 65°F. This metric helps predict energy usage and system requirements to maintain comfort indoors.
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