“…The latter strategy is often combined with thermal mass that allows for thermal energy storage during the peak heat-gain hours and release when the temperature drops. The benefits of thermal mass are often achieved with architectural elements, such as the Trombe wall or roof pond systems 8 exemplified in Harold Hay’s Skytherm House (1973) or Jonathan Hammond’s Sherwood House (1976). However, similar effects, even with a greater energy performance impact, can be achieved with smart materials, such as phase change materials (PCMs), discussed later in this article.…”