Attic stairs, especially drop down stairs, are notorious for acting as large holes that leak hot or cold air out.
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Wanna insulate my attic door, how I do it? : r/Home
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Attic Insulation
The Energy Guardian Attic Ladder Cover improves your home in three essential ways: (1) reduced utility costs, (2) comfort in all seasons, (3) improved indoor air quality. This industry-leading air seal eliminates drafts in winter and hot-spots in summer-lowering heating and cooling bills. It stops the contaminant pathway of attic dust, allergens, and insulation particles from entering your home. Ensure your home's consistent, long-term energy, comfort and indoor air quality solution.
The Energy Guardian R-38 Attic Ladder Insulation Cover and Air Sealing Kit for Pull Down Ladders with Im 27 in. x 55 in. x 10 in.
How To Insulate A Attic Access Cover