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Posted by lemur on December 21, 2008, 1:04 pm
> > Hi
> > Is there a formula, graph or rule of thumb to estimate the extra
> > energy requires to heat a house with an increase in hdd?...ie if it
> > takes 1 mil BTU's to heat my house during a month with 500 hdd's and
> > the next month has 750 hdd i am sure that it takes more than a 50%
> > increase in btu's to maintain temps but I can't seem to find any info.
> > Thanks in advance
> > Rob
> I have been charting therms of natural gas used per hdd and can tell you
> from my experience, that the results vary widely and I haven't been able =
to
> nail down a pattern.
> I believe this is due to the fact that hdds are based on the difference f=
rom
> 65* of the average temperature on a given day, and not actual temperature=
s
> experienced. =A0If you use a program such as HVAC-Calc, you can show the =
heat
> loss for your house at design temperature and can add or subtract degrees
> from design and see the effect of colder temps on BTUs of heat loss.
> If you plan to continue using hdds, try to break out the non-heating use =
of
> gas (cooking, hot water) by checking your gas bills during the 'off '
> season. =A0This will give you more accurate information.
> HankG
> P.S., I would like to see that formula when you get it.
Hey Hank
Already have space heating seperated from total energy and since Im
electric heated I dont have to worry about effiency of heater....Dont
have access to hvac calc....will pass on what I find elswhere but
hoping Ill find answer here.
rob
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> > Is there a formula, graph or rule of thumb to estimate the extra
> > energy requires to heat a house with an increase in hdd?...ie if it
> > takes 1 mil BTU's to heat my house during a month with 500 hdd's and
> > the next month has 750 hdd i am sure that it takes more than a 50%
> > increase in btu's to maintain temps but I can't seem to find any info.
> > Thanks in advance
> > Rob