Heating degree days In a nutshell: heating degree days are a measure of how much (in degrees), and for how long (in days), the outside air temperature was below a certain level. They are commonly used in calculations relating to the energy consumption required to heat buildings.
When the average temperature for a 24 hour period falls below the benchmark of 65 degrees, a heating degree day occurs. For example, if the average temperature is 55 degrees, we would subtract 55 degrees from the bench mark of 65 degrees and come up with 10 degree days. The degree days are then kept track of over a period of time.
At the time of delivery we subtract the amount of heating degree days that have elapse since the last delivery and divide this by the amount of gallons delivered. This provides us with a K-factor (burn rate) for each individual oil user.
As a service to our automatic discount oil delivery customers, we can provide the individual customer information that can be used to check historical efficiencies of equipment. This can be invaluable information to compare pricing and temperatures over a designated period of time.
I hope this takes some of the mystery out of heating oil automatic deliveries.
S. Barkin - Fuel Oil Operations Manager.