From my own experience, get an inspector independently of your realtor.
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What I know and what I can prove are two different things.
Quote:
Originally Posted by killian
would this type of building tend to be well insulated and fuel efficient?
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Get past fuel bills for this house, then look up Heating Degree Days for it's location,
Heating & Cooling Degree Days - Free Worldwide Data Calculation
then get the square footage for the place.
"In US units, one standard cubic foot of natural gas produces around 1028 British Thermal Units (BTU). "
1.4 BTU/[sq.ft.-HDD] is a tight house, 6 is average, 11 is the loosest house for which I got a sample.
For a 2000 ft² house and 750 HDD in December, 80 Therms for that month and an 83% efficient furnace, it comes in at [80*100,000*0.83]/[2000*750] = 4.4 BTU/[sq.ft.-HDD].
Knowing the Outside Design Temperature for the area, the gas usage and the furnace input BTU/hr, you can also determine if the furnace is oversized, which makes for inefficient operation.