Heating shouldn’t be too big of an issue. All exterior walls are 7” thick and will have board and batten siding, 1.5” air gap, 2” foam board and then either another 3.5” airgap or 3.5” of batt insulation or blown in cellulose. I’ll have infloor heat and I’ll throw a 12k btu window unit in a window in the loft for A/C for now, with plans to install a 5-6 ton unit with duct work down the center of the shop down the road.
