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Winter drafts find every weak spot in your house, even if it’s a well-heated one. Warmth slips out through glass first, but small gaps around doors, a pull-down attic stairway, a garage door, and even the walls of a water heater tank can all let heat escape. Tracking down those weak spots is the first step toward keeping your home comfortable and using less electricity to do it.

The following list of proven solutions for sealing in the heat this winter includes everything from simple weatherstripping and draft stoppers to smart controls for managing your heating needs. It mixes affordable DIY supplies, decorating upgrades, and high-tech tools, and it includes several products the BobVila.com team has personally tested.…