I have a 25 yr old 2892 sq ft brick 2 story in Cincinnati, OH. The original (basement) Trane 100,000 BTU XL-90 is on its last legs. The AC was all replaced a couple years ago. On very cold/windy days the current furnace has never been able to keep the house at 70 degrees. The previous owner finished the basement - I don't think the furnace/duct-work was designed for the additional load(?) Basement is always cold in the summer, hot in the winter. Also the upstairs bedroom in the opposite corner from the furnace never gets enough airflow.
-Should I have a newer Trane installed, so that it works with the 'newer' AC and fits into existing space and ductwork?
-Should I go with a larger (120,000+/- BTU) furnace?
-Local HVAC company is pushing Amana as a replacement, good choice?
-A little reading on the internet shows Maytag (made by NORDYNE) has a 12 yr warranty as compared to 10 yr on Trane and Amana, is Maytag a good choice?
(Maytag MGC2TC120D45D 120,000 BTU 95.1% Gas Furnace, 2 Stage)
-Can the existing working Aprilaire be reused, or does it need to be replaced?
-What is reasonable cost to have old furnace pulled out and a new furnace installed?
Any thoughts and advice would be greatly appreciated.