A few years ago, we decided our spider-infested and roof-rotting shed needed a new use.
Since we love to have homegrown vegetables and plants, we invited our bestest buddies over once we removed all the siding/roofing. With superhuman strength, we lifted it over to a sunnier location and used plastic which had been given to us to cover the entire structure. My dad ensured less loss of heat by installing boards along the top. He also gave us an old cupboard door to use as a window which can be propped open when it's very hot.