Many discussions have addressed energy savings for heating, but scientists warn: The strongly increasing worldwide energy demand for cooling, which may even exceed the demand for heating in the future, is not sufficiently considered in the current debate. PCM are a superb possibility to face this challenge in a cost-efficient and environmentally friendly way. They are able to store large amounts of energy and facilitate the use of more renewable energy and improve the indoor comfort by passive cooling without any energy consumption.
You will find more details in this article which was published in The Guardian on 26 October 2015.