For cheap insulation, put bubble wrap on your windows to help keep the heat in. Just spray them with water and the bubble wrap will stick to the window. : r/Frugal
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ASTARC Plastic Window Insulation Film, Self-Adhesive Thermal Insulation Heat Protection Film, Cold Protection, Windproof, Thermal Cover, Transparent Insulation Film for Thermal Insulation on Windows 1.5 m x 1.5 m : Amazon.de: DIY
How to Insulate Old Windows without Replacing Them | Indow
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How I Insulated Our RV Windows for Winter
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