Thanks Vic. Unfortunately its an electric unit with no option for gas so its a heat pump/furnace system. Everything down to the freon line and electrical box outside are getting replaced. All companies that came out for estimates suggested moving it to the side of the house rather than under the deck. It does have proper clearance where it is but they were worried about noise. Also need to add a cold air return as there is 1,000 CFM output but only 800 at best input. So yeah, the $6100 is for a 14 SEER unit with a variable speed motor bringing it to a 15 SEER. The $4700 is a 13 SEER unit with variable speed motor bringing it up to a 14 SEER. Two different companies. Leaning toward the $6100 job.