9#Anniehui 3 c/ b1 L# ?4 o" G7 P& J" z' K o+ q' | {( s5 b
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.
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8 V' {2 Y& W( m3 J7 V+ IMy 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.