Vertical Isotherms & Thermal Breaks: The Secret to Window Insulation & Lower Energy Bills Why are your energy bills so high? The secret lies in a concept called the Vertical Isotherm. This video breaks down the science of Thermal Break Technology and reveals why it's the most critical factor for preventing heat loss, eliminating window condensation, and dramatically lowering heating and cooling costs in your North American home. Understanding High-Performance Window Frames: * What is Thermal Bri