My New Garage

Insulating the shed is not really about saving power. It is a creature comfort idea. Even without true AC, the slab floor will help keep the temps down if it does not heat soak.

When its 115F out and the shed is a chilly 90F it makes a huge difference.

Or like up here in the Seattle area, when its 40F and pouring rain, having a warm 60F shed without draughts is so nice.

My attached 3 hole garage is 725 sq/ft so not huge but I wish it was double sized.