9#Anniehui ! _% b8 I' i5 W2 v* I# R) e+ j0 z# I1 q' L
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 , u) _; E+ w" n2 g5 x" J; h1 w. `9 x+ X3 G7 p E
- H- Z. h% J; a0 s) EMy 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.