Weatherization is one of the most accessible, high-impact home improvement categories. These products offer consumers cost-effective ways to reduce energy loss and make homes more sustainable. According to the U.S. Department of Energy, air leakage through cracks and openings can account for 30% or more of a home’s heating and cooling costs. Since most DIY projects are simple. Homeowners don’t need special skills to seal gaps around windows, doors, and siding, but they do need advice from a knowledgeable salesperson to select the correct sealant.