At the end of 2017, the average U.S. commercial building was just under 50 years old. As commercial buildings age, their façades and systems can begin to degrade or malfunction. This enclosure performance degradation can lead to poor thermal comfort, poor indoor air quality and wasted energy, contributing to an increase of energy consumption for the building. With many commercial buildings aiming to reduce their energy footprint, retrofitting a building enclosure can deliver energy savings, as well as an improvement on the building’s appearance.