Therm vs CU. FT
my gas company sells gas by the cu ft. im trying to use this page to see how much cheaper my heatpump is over gas http://www.energyright.com/cgi-bin/dtc?tvaparms
here is what i pay for gas
how much do i pay for a therm?
my heatpump is a 8.2 HSPF is it more like a 220% or more like a 300%
1 cubic foot = 1,000 BTU/hr
1 therm = 100,000 BTU/hr or 100 CFH
You do have to know the BTU content of your local gas. For a long time, ours was 910 BTU per cubic foot. Now they've finally gone to the standard of around 1000 per. Some areas it is more than that. I believe that Rheem sizes it's orifices for 1075 BTU/cu ft gas. Had some problems back when we were real shy on heat.