But I'm quite confused about which type of furnace to go with. Each bid we've taken has carried a different recommendation. The first said we shouldn't settle for anything less than a 98% AFUE unit, vented through our garage (we'd need to install new horizontal venting). The next said he'd install a 90% unit if we asked, but didn't seem to feel it was necessary. The final bidder said whatever we did, we should make sure we installed a 2-stage furnace but AVOID a 2-stage variable furnace.
What's the skinny on variable speed vs. plain vanilla 2-stage speed? My contractor who doesn't like variable speed blowers says they're more complex and therefore more likely to create problems. And since we're expecting to stay in this house for the life of our 30-year mortgage, should we get the highest AFUE we can afford?