What Makes a Door Energy Efficient? Multiple Glass Panes: Double or triple-paned insulating glass is used to reduce heat flow. Tighter Fit and Improved Weather Stripping: New frames may include a magnetic strip to create a tighter seal that reduces air leakage around the edges. Improved Core Materials: Fiberglass, wood cladding, and steel with polyurethane foam core are among the most energy-efficient door materials available today.

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