Extending the life of a cheap aluminium greenhouse

My fallback option when a GH is, just a frame, is to cover it with debris netting. This would be enough to cut the wind and protect against frost. If you have a potting bench inside the GH, cover that with plastic as it would be easier to do. I've used those blowaway cheap GHs inside a big GH, attaching the blowaway to the GH frame to stop it living up to its name.