3M Sun Control Window Films from All-Spec Sun Control reject up to 97% of the sun's heat-producing infrared light and reduce annoying glare. By helping to keep your home cooler in summer and warmer in winter, 3M™ Window Films also help make homes more comfortable year-round. They do this by rejecting up to 78% of the sun's total solar energy from entering through your windows. In addition to keeping you cool, blocking out irritating glare and heat can help protect your furnishings from fading.