Winter demands proper window caulking for energy efficiency and home protection. Prepare surfaces, choose the right caulk (silicone, acrylic, polyurethane), and apply it around windows, doors, and siding for a weatherproof seal. Seal air leaks to reduce heat loss, saving energy and money. Maintain caulked areas to ensure optimal performance. Consult professionals for complex needs or specific window materials, considering factors like weather conditions, window type, and insulation type.