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Heat/cold degree days and Chill hours: Difference between revisions
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==Heat Degree Days==
You may have a thermostat that makes your heating come on when the temperature falls below a threshold.
Cumulus calculates an integration of the number of degrees below a threshold you select
Cumulus reports this by month as part of the National Oceanic and Atmospheric Administration (NOAA) style report, in the annual NOAA report, in dayfile.txt, and via heating degree days web tag. (NOAA is an Operating Unit of the U.S. Department of Commerce).
If the threshold you select in Cumulus matches your thermostat, the reported value gives you a measure for how hard your heating system has worked; otherwise it is a statistic that gives you a feel for how cold it has been.▼
So if for the whole of November, there was
== Use of Heat Degree Days ==
If you compare the heat degree days figure for two periods, then one would expect to have a higher heating bill in proportion to the increase in heat degree days. Additionally, introducing energy efficent measures can only be evaluated if one makes allowance for the heat degree days before and after the new measures.
▲Selecting the right threshold can be crucial, it might be as used by a thermostat to switch on the heating, or the planned comfort temperature. If the threshold you select in Cumulus matches your thermostat, the reported value gives you a measure for how hard your heating system has worked; otherwise it is a statistic that gives you a feel for how cold it has been.
==Chill Hours and/or Air Frost==
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