9#Anniehui . R$ ^' _: ?6 M3 ^' C$ d % b# o, r9 N! c( ]Is it your greenhouse ? Look like it is a kind of transparent sheet attached to the wood frame, not glass or anything, right?
3 J- s' t, l( \: X+ ~# a ) E% o, V: \: U# W: x+ uMy 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.