HVAC questions - new system quotes
Our a/c unit needs to be replaced and I am not sure which system to go with. We have two units and we need to replace the lower level unit (main floor and finished basement). Our furnace is basic builder grade, installed in 1998, but it still works fine. Unsure as to whether we should just go ahead and replace. We are located in Northern Virginia, with summers that are quite humid.
I've received several estimates and here are the different options we have been given with the lowest quote for each (prices include rebates):
Option 1, ($7,581): Carrier Infinity Series 80 two stage gas furnace 58CVA090 with Infinity Series 17 3 ton two stage a/c 24ANB736
Option 2, ($8,428 but this is for 48 month 0% financing. I need to find out the pay now cash discount): Trane XV80 two stage gas furnace with Trane XL15i 3 ton a/c
Option 3, ($4,300): Carrier Comfort Series 16 a/c 24ACC636 only
Option 4, ($4,819): Trane XL15i a/c only
I feel that all the companies I have contacted are solid, with good reviews so that doesn't seem to be a deciding factor. Any opinions would be greatly appreciated. Thanks.