* This calculator is designed to provide approximate estimated potential savings. Actual savings can vary depending on many factors like fuel cost, building structure, and other variables. A professional energy audit is the most accurate way to estimate potential savings for energy-efficient home improvements.
What is Degree Day?
Degree days are measures of how cold or warm a location is. A degree day compares the mean (the average of the high and low) outdoor temperatures recorded for a location to a standard temperature, usually 65°Fahrenheit (F) in the United States. The more extreme the outside temperature, the higher the number of degree days. A high number of degree days generally results in higher levels of energy use for space heating or cooling. Read more