Advice needed on new hvac system in NC
We are planning to replace our upstairs heating and cooling system.
We currently have a 3.5 ton ac and 100,000 btu furnace - the ac parts have been replaced over the years with mismatched parts by AHS but we are still having issues and the heating system is the original from 1992. It's a split system most of it is in the attic and the ac compressor is outside. We are in NC so we have typically hot and humid summers and relatively mild winters. The ac has been failing for the last 4 yrs since we bought the house and can't seem to keep the house cool without breaking down a couple times a season. Our first floor is heated/cooled by an American Standard gas pack the previous owner put in 2004.
The upstairs is about 2000 sq feet. We are also thinking of finishing the 3rd level (attic) in the next year or two which might add 500-600 square feet up there- with a separate bedroom, bathroom and the rest being open area. When getting prices for the 2nd floor unit we'd like to take into account the 3rd floor as we would hate to have to spend more than a couple thousand dollars down the road to heat/cool the 3rd floor. There is currently very minimal insulation in the attic and we are thinking of adding insulation up there.
I have just started getting quotes and want to hear people's opinion on the different brands and what your recommendations would be to us as far as efficiency, heat pump vs furnace/ac, replacing the 20 yr old ducts vs keeping them etc. We would like to add some kind of filter probably media filter and possibly something to increase humidity in the air in the winter time. So far we have a quote for the trane XV80 furnace (tdd2c100a9v5va + 4txcc044bc3hcb) and XL16i (4ttx6048e1000b). I also have a price for American standard and goodman equipment. Please let me know your recommendations. Thanks in advance.