Yes, caulking can contribute to improving insulation in a building or home by sealing gaps and cracks that allow air leakage like cracks and gaps around windows, doors, and baseboards. When properly applied, caulk helps create an airtight and watertight seal, preventing drafts and outside air from entering and conditioned air from escaping. By sealing these openings, caulking can effectively reduce energy loss and improve the overall energy efficiency of your home.