Homes can lose 10–20% of energy through weak doors. That hurts bills and comfort. So, when is it time to act? It often starts with small signs. Drafts, squeaks, and sticky locks tell a story. However, many homeowners ignore them until winter hits. Then the pain shows up in heating costs. There is a simple guide, though. Check how the door moves, seals, and sounds. Also, look at the light...
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