Is there a standard relationship between HDD (heating degree days in C or F) for a general location and the calculated heat loss BTU/hr for a specific house ?
I used the SlantFin heat loss calc and came up with a reasonable number for my house, I think (85000 at -35F) (-35F because im considering a gshp but dont have much extra electric for strip heating.. in any case, -25F didnt make a huge diff..)..
The average HDD in F for this locale is 9500 (at the airport, closer to Lake Superior (ie, is more moderate)).. but it should be close.
Should I be running to the home depot for insulation/etc, or does that sound about reasonable ?
BTW, its a 1000sqft x2story slab-on-grade (but with a 5ft foundation also), 600sqft attached garage (i keep it at ~38f), upper story is 1977 code, bottom is 2001 code (jacked it up with a reno).. oil boiler into hydronic in-slab and an air handler to ducts upstairs.
Thanks for any info.