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Old 03-09-12, 09:17 PM   #2
MN Renovator
Less usage=Cheaper bills
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Join Date: Nov 2010
Location: Minneapolis, MN
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Getting a new furnace is great and all, especially if you have a cracked heat exchanger or your place ends up being sealed up well enough to need a 2-pipe install but the usual takeaway from having an energy audit and doing renovations to reducing usage is that you usually end up getting a smaller furnace installed.

If you had an energy audit and are doing what you should to reduce your heat loss, you better have a mighty big house for a 80 or 90k furnace. I have a house with fiberglass insulation and I could run a 40k 95% furnace and still be at 70 degrees inside when it's -40c or -40f outside and this is with 2200sq ft.

Fix the house first, then get a load calculation that factors your air infiltration and insulation after you've done your work and before you make a 20 year mistake on an oversized equipment purchase that won't be as efficient as it could be because its oversized and running short cycles.
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