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Is it your greenhouse ? Look like it is a kind of transparent sheet attached to the wood frame, not glass or anything, right?
) O: x. j/ }1 F7 K ) h7 K+ q4 b/ x2 S. i0 G# B. {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.