Long time lurker, recent register-er.
We recently bought a 1000 sq ft ranch in SE MI, built in 1964. Full basement, partially finished, small addition on a slab. We have been getting quotes to install Central A/C and a new furnace. Our current set-up is 1987 Comfortmaker, with no A/C. Two salesmen said my furnace is an 80% efficiency unit, third guy said it was an 88% (supposedly one of the first attempts at higher effeminacy models?) Based on seeing what the previous owner did, I'm not sure much maintenance was done during her occupation. As far as BTU and A/C size, all three quotes all match, with one doing a load calc, and one saying they send their engineer out to do one after job acceptance. One sells Trane, One sells Bryant, and one sells Carrier. All three have great recommendations, and we are pretty close at making a final decision. (surprisingly the Trane guy is about $ cheaper).
So here is my question:
1 rep said we should get a 95% efficient VS. The other (most expensive) said go with an 80%. Until my third quote, I figured he was just trying to make the sale. But the third guy gave us prices on both an 80% and 95%, but recommended the 80% due to our home size, age, and pay off time. I'm looking at at least $ more for the high-efficiency units. Is there still a case to be made for only getting an 80% unit, or would I be better off with the 90+?
Any and all help appreciated!!