There are many different types of heating methods in the world. Most of these heating methods are through radiation and convection. These heating types emphasize insulation because it is important to maintain the indoor air temperature. In contrast, the ondol, emphasizes thermal storage in the floor because it heats conduction. In other words it heats through direct contact. This unique heating method has created a unique interior environment. Activities have to occur close to the floor so that people may come in direct contact with the heat, thereby influencing the cultural development of the Korean people. The ondol has also created an interior environment where it is warmer near the floor than the ceiling in contrast to other heating systems where the area close to the ceiling is warmer. This environment is inline with the optimal healthy conditions the Koreans prefer, the warm feet cool head environment.