9#Anniehui 8 Y4 y* n; u5 y# j. g2 u# u& Z9 x$ N. f( b$ D; ^6 I
Is 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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It's two layers of greenhouse plastic that is inflated with air.
15#ceramistpalace # ]4 m: @* y- P% W9 @5 Z* k 6 m) v {7 l- W) D + ^+ M( l: t* K- j2 A; c; VMy 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.