16 seer 4 ton AC and coil 10 year parts warranty 10 year labor warranty Lifetime outdoor unit replacement compressor warranty Supply plenum Return plenum Return air base Nest thermostat (free from the manufacture) High flow registers (this will free up restricted air to the upstairs level that needs it the most) Attic insulation (attic is grossly under insulated. This will cause substantial heat gain from the ceiling) Correct the return duct for proper air flow (remove the 8†ducts from the 14†run and reconnect then directly to the return plenum)