Advances in window technology have turned windows from a heating/cooling weak point into a critical asset in the pursuit of energy-efficient construction. Installing the correct windows into the correct spaces has been shown to drastically lower heating and cooling costs. High-performance windows not only fulfill the traditional roles of windows (light, views and fresh air), but can be active, positive contributors to the temperature of your home in every season. The right windows can decrease heat gain in a home during the summer, decrease heat loss in the winter and may even provide heat during the winter.