9#Anniehui 9 y0 X# Y& e/ a 6 y3 a/ j& `6 j" V% vIs 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.
: s6 w8 S5 v+ x2 a# h2 l7 R E5 _7 w9 u+ JMy 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.