Last fall I upgraded my furnace from a 88,000BTU 80% to a 44,000BTU 90%. My gas bills are at record highs, although I'm sure some of it can be attributed to the record cold weather we've been having in Moore Oklahoma. I've talked to friends/neighbours/co-workers and they have said theirs have "gone up some" but won't give specifics.
Where do you find HDD data and how to you calculate the increased "load" from colder weather? I downloaded the HDD file using a 60 degree base temperature. Heat doesn't run when it's above 60 outdoors.
from a link in my other thread I caught this quote:
On page 8-14
"For ease of processing and of meeting data requirements, the industry standard for many years was to use a fixed 65° F for both heating and cooling degree-day bases. However, actual and normal hourly weather data are easily available now, providing flexibility in the choice of degree-day bases.
In general, a degree-day base of 60° F for heating and of 70° F for cooling usually provide better fits than a base of 65° F."
Good find, explains why 65 was always used as a "compromise" base temp. Base temp varies considerably based on solar gain/wind chill. Using average daily temp certainly makes more sense than high/low for a particular day. I'm still liking the "monthly average temp" method.
We just got our latest meter reading, 8.59DTH March 12 meter read date. Use is again consistent with weather.