Trane XL15i vs American Standard Heritage 16
My husband and I recently moved from the Midwest to Greenville, South Carolina and are in need of HVAC advice. We are looking at replacing our 20+ year-old heat pumps with something more efficient and reliable. We have a 2700 sq ft house, which includes a bonus room over an unheated garage. We've received quotes from 3 contractors and have narrowed it down (we think!) to either a Trane XL15i (with or without backup gas furnace), or an American Standard Heritage 16, with or without gas furnace. We also had a quote for the American Standard 15, but since it does not have a variable-speed fan motor, we ruled it out. The American Standard quote is for a 3-ton unit upstairs and a 2-ton unit downstairs. I don't know the "tonnage" of the Trane units, but the XL15i-24 was recommended for the downstairs, and a -30 recommended for the upstairs, if that is any clue. I have no idea from either quote what air handler or thermastat would be installed. Can anyone please tell me: 1) Is a backup gas furnace useful for this area? 2) What would be the best system for handling the summer humidity? 3) Are there other manufacturers we should be considering besides Trane and American Standard? 4) What other questions should I be asking these contractors? I feel so lost! Thanks for any help and insight you can provide this transplanted Midwesterner!