For a few winters now we've bubble wrapped an aluminium GH using brown tape & a few pegs. Advice re ventilating is essential: just open the window & door during day time. Even doing that many years ago a heater still caused excessive/damaging moisture so I concluded our 6x6 GH too small, & not worth it. I've not lost any plants over-wintering outdoors & GH as I've described. INcidentally it would cost me a lot more to replace my plants than the price of online wrap & re-using plastic bags. We also bought, very cheaply, horticultural fleece which is amazingly effective draped over outdoor plants, weighted down with bricks/stones. All re-useable.
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