Greetings from New Hampshire! I have a Morton building (36 ft. x 55ft x 16 ft.high), 2 insulated bay doors. When i purchased, i had them use their own insulation pkg, thermal breaks i thing every 8'9"(vs every 16"), heated is natural gas(modine heater/blower), when im not there thermo stat set at 50f. due to our water line, when working in there or puttering around, 58-60deg.,buling is very tite..unless you open overhead doors! Im happy with the Morton building, 10 years old, no issues.....