5. Seal doors
Do-it-yourself: Prevent cold-air leaks with a draft snake: a plush doorstopper placed in entryways to stop drafts. If you’re crafty, make your own, but something as simple as a rolled-up towel will do.
Big fix: If your front door lets in more drafts than people, consider upgrading to an airtight model with double- or triple-glazed glass, an insulated core and good-quality weatherstripping (some newer frames include a magnetic strip that seals more tightly).
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