I have a 60x80x12 shop, split into 3 sections, 1 is 60x56 with 1-14x12 overhead door and 2 are 24x30 sections separated by slider door. front room has a 10x12 over head door. both doors are commercial insulated doors with good seals. does have a few 3x3 windows.
its batted insulation in walls...