Originally posted by coco
wow i never thought about such large a/c 's down south we it takes a 4-5000 sq ft house to get 4 or 5 tons of cooling in mn
Your homes up north are designed for severe temp differences in the winter being the reason yo can cool maybe up to a 3000 sqf home with a 2.5 to 3 ton ac. Just for kicks someday recalculate with wall insulation of r11 and cieling insulation of r19 and see the difference.

I use the 600sqf per ton for estimating only. All of my homes are manual j calculated before quotes are given. In the Tyler Tx area I have homes of about 1800sqf with 2 to 4 ton systems. most get a 2.5 to 3 ton on new construction and 3.5 and 4 ton on older less well insulated homes