9#Anniehui- M* U) b1 k' Q/ T, v) f
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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?
13#ceramistpalace ; B* M# C7 d* X% e, O( r6 K: _* ^4 L( y2 m" U) A: P% z( Y, w* k1 K# _6 @/ N
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It's two layers of greenhouse plastic that is inflated with air.
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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.