Q. Why do you insist on using degree day data?
When comparing the energy consumption of heating plant before and after an energy-saving initiative it is essential to take account of any variation in outdoor temperatures. Put simply, comparing gas consumption from a cold winter with that for a mild winter is meaningless. The answer is to use degree day data provided by the Meteorological Office to adjust gas consumption figures accordingly and provide an accurate picture of performance based on the heating requirements during variable weather conditions.
Any analysis and savings presented that does not include Degree Day normalisation will be incorrect.