Did you know that, according to EU, energy that used to cool buildings will increase by at least 72% in the next 15 years? The reason is that the number of warm days per year is noticeably rising steadily. So we have to think more carefully about cooling than about heating. Nowadays, homes are so well insulated that it is not heating but cooling that sends energy costs skyrocketing. If the interior heat is not extracted during warm periods, there is a risk of overheating.