4 Ton vs 5 Ton; 2 stage vs 1 stage condenser
Comparing two estimates for replacing 20+ heat pump system. City is offering $1400 for conversion to gas furnace. Two bids from reputable contractors and don't know what to do.
1. Trane XR15 Single stage cooling split A/C with XV80 80% gas furnace with two stage heating and full cased cooling coil
14.5 seer, 12.0 eer, 4TON SYSTEM
warrenty: 2 yr labor/ 10 year compressor, coil, parts, limited lifetime heat exchanger
2. American Standard 2 stage heat/air 5 TON 16 seer
warranty: 10 yr labor, parts and compressor
Contractor 1 feels 4 ton system is what I need. He will also repair 2 damaged flex lines, install manual air volume dampers and increase size of one return duct from 14" to 16", and seal all duct connections.
Contractor 2 says his load calc indicates 5 tons and mentions nothing of flex lines, dampers or duct. (Should I be concerned about this?)
I live in North Florida. House is 2618 under AC (A & B on sketch are under AC, D is garage and C is front porch). Attic insulation is R-30 and windows double pane. Lots of shade.
Cost aside I am stumped as to what is the best system for my house. I understand that sizing of the unit is important and I don't know which way to go. HELP...please!!!