I have a small shed that is under the main roof but on the outside edge of the car port. So not really attached to the main house. It is about 42" interior width x 19' long. 2 doors for entry. 2 x 4 stud walls at 16" OC with 6.5" tall by 3.5" beams for the roof, 24" on center. The problem is humidity. I store tools there and am looking to reduce the humidity so I don't have to constantly work on keeping them rust free. If I were to insulate it really well would that help? Not planning on HVAC, the space is too small(tho' now that I think about it I might post in the HVAC section as well).