We are four guys from Westerlundskas technical program currently in our second year and our names are Andreas, Martin, Mithushan and Oscar. Our group assignment was to improve something existing in mind of the environment. We searched through the whole world wide web to find a topic that is interesting for the entire group. We stumbled upon a way to keep the warmth inside a house and it’s called passive house. We search a little bit about the subject and found out that passive houses is a good way to do something that’s not impossible and will do a big change if we started doing it. But what are passive houses?