Find out about how Phase Change Materials (latent heat technology) are being used in building applications. PCMs can smooth daily temperature fluctuations and prevent overheating in buildings. They can also be used as part of low energy ventilation and cooling systems. Phase Change Materials (PCMs), or latent heat storage materials for building applications, are an emerging technology in the UK. They offer a solution for improving the thermal performance and comfort of low thermal mass buildings currently being constructed using modern materials and techniques and also when renovating existing building stock.