I'm in the process of getting bids for a new condenser, furnace and humidifier after my 21-year-old compressor shorted to ground. I've got a 1958 ranch house in Kansas City. Around 900 sq ft. of conditioned space with an unfinished basement. Per my choice I was going to have company "A" install a full Goodman setup (my choice) of an 80% 2-stage furnace and a 13 SEER condenser. We figured out I could actually save $250 after rebate if I moved up to a 14 SEER unit. The original estimate from company "A" (and 3 others) all called for a 2.5 ton condenser and 70,000 BTU furnace. (I now have a 65% 75,000 btu and 8.5 SEER 2.5 ton setup now.) They're now saying to get the 14 SEER unit I'll have to move up to a 90,000 BTU furnance since the coil is bigger. They said it's pefectly fine since it will run on it's 60,000 BTU low setting most of the time. (He earlier said it would run on low for 10 minutes then move to 2nd stage until it hit the set temp.) Am I nuts for thinking that's too big for a 900sq ft. house? Not a single company has done any load calcs on the house. "It's a basic ranch house. . . no need to." Sorry for rambling. Thoughts???