Hanoks have different shapes in different parts of Korea. In the northern part of the Korean peninsula, Hanok have the structure of a house with several wings. The wings are often built in either a square or the letter L. This helps keep the wind out of the house in the colder northern places and helps keep the house warm. These kind of house also has low roofs. In the warmer southern Korean peninsula, Hanok have a single wing and a wooden floor. This helps let the air in and out.