I too question the 2.5 ton system for a 1,000sqft house. FWIW my house is just a little south of your and 50% larger. Just installed a 2 ton A/C. Furnace is 88,000BTU that came with the house, although 45,000 would have been more than enough. A/C went bad, but furnace still good, could justify replacement just because it was oversized.