Under our attached woodshop, there is a storage area accessed by a single garage door as well as a walk-out door. Seldom use the garage door. The woodshop has an electric heat pump that also serves the shop basement. The ceiling is not insulated. It is convenient to store a trailer load of wood. We have been thinking about building an exterior, easily removable, wall that would insulate/minimize energy losses in summer and winter.

Has anyone ever done this or have advice on some easy to construct panels to achieve our goal?

Our house is ICF (insulated concrete form), and the face of the garage door is inset about 12 inches. The garage door faces south. The house is geothermal-and now wish the woodshop was the same.