Igloo houses have a chimney. The chimney exists in the form of a hole at the top side of the igloo building. The chimney is a very important part of the igloo house, and it has some functions. The chimney prevents the igloo from melting. Without a chimney, an igloo can become too warm, and which can most likely start melting the ice, then the whole chimney would collapse in no long time. When the igloo house seems to get too warm, the chimney would be widened so as to allow the inlet of the cold breeze.
Also, on the other hand, when the igloo is getting too cold, the chimney can be covered with leather, either fully or partially. Therefore, the chimney is an essential part of the igloo house. There are three major holes or spaces that are part of the igloo house, which are the crawl entrance, window, and chimney. They are all very important parts of the igloo house.