I tried DIY the inner window of the bathroom to prevent the window from getting cold.

I made my own internal window using hollow polycarbonate to protect against the cold and sound in the bathroom.
By using two sheets of plasticdan, we were able to increase the insulation effect and successfully achieve soundproofing. I took measures to prevent my child's voice from being loud when taking a bath to prevent it from becoming a nuisance to the neighbors. It is also effective as a measure against heat shock for the elderly.
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