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"Have someone go up in the attic and seal any penetrations between the ceiling and the attic, like where the pipes and vents go through, and add spray foam insulation to the rim joists in their basements or crawl spaces," Zuber says. "This is the area above the concrete or concrete block wall, where the floor framing meets the exterior wall. Adding attic insulation also provides a nice return on investment if there's less than 10 inches of existing insulation."