North Star’s high-performance windows and doors are designed to hold in those comfortable inside temperatures your family enjoys, keeping out the cold, wet and summer’s heat. And while you are enjoying your home, your new North Star windows and doors will help you to save money. To increase the efficiency of our windows and doors, North Star uses energy-saving Low-E glass that features a near-invisible coating that reduces the amount of heat lost while letting in maximum light. North Star High performance vinyl windows are on average twice as efficient as the average window made ten years ago and can help reduce your energy bills significantly.