I am trying to decide between a variable speed and multispeed fan for an 80% gas furnace. I don't care about comfort (for the purpose of this post anyway), I just want to know whether I'll save enough in electricity costs over 10 years to make up the substantial difference in cost.
Problem is, I can't find published specs for the blowers to figure out how much electricity they use ... and besides, since I don't run my blower 24/7, the best I could do is a rough estimate even if I had the specs.
I'm specifically looking at Trane XL80 vs. XV80. I use 300 therms of gas per heating season.