Even the best insulation can lose its effectiveness if air leaks are left unaddressed. Small gaps around windows, doors, vents, and utility penetrations contribute to drafts and energy loss. Thoroughly sealing these areas with modern caulks, weatherstripping, or expanding foam effectively blocks unwanted air infiltration. Not only does this keep conditioned air inside, but it also prevents moisture and allergens from entering your living space. Combined with insulation upgrades, air sealing forms a comprehensive barrier that protects both energy efficiency and indoor air quality.