Here is a summary of my contractor's Manual J calculation--he had thought 2 ton, which he is sticking by, because we are only conditioning the top floor of a raised ranch, and he feels the extra half ton will allow cool air to drop without short cycling. Do y'all agree? Some basic house info is below. If so, we'll be going with the Trane XB13 (same warranty as XR, but a bit louder--not an issue based on placement) and TAM7 (better dehumidification, quieter, bumps to 14 SEER).
Gain BTU Loss BTU Gain CMF Loss CFM Base Board Tonnage
17731 30320 592 574 56 1.5
Home is in Southern NH
20" blown-in insulation
All new windows, doors, siding with 1/2" foam insulation
Raised ranch, 46 x 26
Basement half underground
Anything else needed to confirm our decision, please let me know. Thoughts welcome!