Heating fuel usage diagnostics
By instinct it seems to me like I blew through a lot of propane, so I am trying to wrap my head around the best way to gauge useage, compare useage, find out what rate of useage is good and whats terrible.
There is some approximation and light rounding but I used approximately 200 gallons of propane from Jan 4 through Feb 8 based on Jan 4 fill and checking the gauge today. I use propane for heating and a 5 burner range top used usually twice daily, but usually just one burner. According to Weather Underground I had 1794 HDD during that time period, my house is 4500 SF including the conditioned basement which is unfinished and 41,220 cubic feet.
Heat is from a 96% 60,000 btu modulating furnace kept at 70 except for a typical M-F setback to 62 starting at 7am to 4pm.
I have no idea how much propane is allocated to the range top, my econet tells me the last 2 weeks I ran 103 hours on high heat and 43 hours on low heat, doubling that and guessing low heat at 40,000 btu I come up with 206*60,000 + 86*40,000 = 15,800,00 BTU used. Divide by 91,600 BTU per gallon = 172.5 gallons used.
With those numbers, what is a useful benchmark? BTU per HDD per SF?
Does Gallons172.5/HDD1794*91600/4500SF = 1.96 BTU per HDD per SF make any sense, if it’s not flawed does it sound good. If it is flawed what is a good equation to gauge the effectiveness of a thermal barrier?
Thanks in advance for any opinion, discussion or advice.