The building envelope is only as effective as its weakest element and all too often these areas the doors and windows in a home which can account for up to a third of the overall energy loss according to the APA. Not only do these openings lead to energy loss, but as a result of less than appropriate levels of insulation, condensation can occur, which can lead to damage and can cause mold and mildew. Technological advances have seen the creation of advanced window and door systems which prevent energy loss and condensation.
Because glass is a poor insulator, the large amounts of energy that are wasted trying to keep the interior of office buildings and schools comfortable make glass unviable for those who wish to create an effective building envelope. Designers are torn between form and function, having to compromise either their vision or sustainability goals. Now phase change windows offer a new evolution in energy efficient window systems that will enable designers to let the light shine in.