Products are chosen independently by our editors. Purchases made through our links may earn us a commission. Feel that cold air seeping through cracks or drafty windows? Well, it means your home isn't fully insulated and, as the weather turns to less-than-ideal snowy and windy conditions, those weak points have come screaming to the surface. You may see more expensive heating bills hit your mailbox as temperatures plummet, especially with high energy costs of electricity, oil, and gas.