New system for attic and which one?
Hello, 15 year old home in Az. Downstairs about 900 sq. ft on mini splits. Up stairs furnace and coil in much needed closet that I would like to make into powder room. Current system 12 seer 4 ton compressor with 88btu furnace. Would like to move above current location to free up the space or put in the garage and run a return an supply from the floor below to the attic. I have received 3 quotes. Two of them for Rheem units and one for goodman. These were 18seer. My questions are if 18 seer is 18 seer and the install is 90% of a new system install, why not go with the least expensive ? and would it be too draining on a system to put in on the floor below the one it is cooling and to the attic(about 15-20 ft)