Insulation in the attic of the home is one of the most economic and effective ways to keep a home both warm in the winter and cooler in the hot summer months. But having the insulation improperly installed can actually cause problems. Over time, insulation can shift and move around, so be sure the "vapor barrier" on the insulation is facedown, and not faceup. If it's faceup, the insulation can actually trap moisture and become a breeding ground for mold. If flipping the insulation isn't easy, you can take a box cutter and cut small slits randomly on the insulation to allow trapped moisture to escape.