I'd like to use my wood shop in the winter. It's a detached, 20x14 shed and I installed a 5000watt garage heater already but it takes a while (hours) to heat up and it's probably very wasteful since there is no insulation. I'm looking for the best place to start to help heat it up quicker and keep it warm longer. The walls are 2x4 studs so I could use bats and the ceiling is gabled with storage above. I did noticed that it appears the eves are open vented too so heat is probably just rising right up and out the eaves, is it okay to block these?
I'm in New England so it gets pretty cold, it's about 19F right now. Ideally I'd like to work comfortably when it's 30F>
I'm worried if I add bat insulation I'll have to cover it which adds to the expense not to mention at like $40/section it would cost a lot to do the walls let alone the ceiling.
Could I vault the ceiling so it stays vented but still gives me space up there? Basically insulated with rigid foam and plywood up the rafters?