" M0 s( p2 O) W# i$ ~, T' m/ OIs it your greenhouse ? Look like it is a kind of transparent sheet attached to the wood frame, not glass or anything, right?
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' G* p/ g( D- |' X, x W- j. B* o( @My husband seals the plastic layers himself, then use a small fan to blow air between the two layers. The plastic can only be bought at Horticulture supply stores.