By rejecting solar heat in the summer months by up to 85% and by increasing winter heat retention by up to 88%, you can significantly reduce your heating and cooling costs while simultaneously improving your comfort and protecting the health of your family. Since windows have the most extended replacement cycle of anything in your home, you have 15-20 years to enjoy the savings. You can expect a return of between 5-15% per year on your heating and cooling bills, which calculates to around $0.20 per square foot. Multiply that by the size of your home, times 12 months a year, times 20 years, and you start to understand the sort of savings you could experience.