DIYbanter - View Single Post - New (house) heating system... is this a good/great deal?

John Weiss[_4_]

wrote:

40,000 BTU total sounds quite low from my experience. *I just had an
80,000 BTU York (98% efficiency) installed in my house in Seattle.
*All my previous houses (around the country) had furnaces of around
100,000 BTU (80% efficiency).

Good point.
I think you may be right. I would have thought 40,000 would be
enough for the bay area. But here's an online rough estimator
that says for 2,000 sq ft, you need 58,0000 OUTPUT btu. Assuming
95% eff, he'd need 61,000 btus.

Of course, this is just a rough estimate calculator, but I'd trust
it more than the shyster he's dealing with. Given the more
temperate climate, I'd also go with a two stage if possible so
that it can fire on low most days.

I don't know that there are any gas-fired furnaces at the 95%+
efficiency rating that are not multi-stage. The one in my old house
was 3-stage, and my new one has a 3-stage fan with a true variable
burner.