This is an estimate to replace existing 3.5 ton unit with a 4 ton system. Customer would like to keep system in existing location. Replacement includes: 4 ton 80% BTU Furnace with X-13 motor 4 ton high efficiency aluminum coil 4 ton 15 Seer2 AC unit Warranties: 10 year parts 10 year compressor 10 year coils 20 year heat exchanger 1 year labor