The heating system of the kiva was incorporated into the design of the structure. By placing the kiva partially below ground and using an earthen roof, the builders took advantage of the constant soil temperature and reduced heat losses from wind.
In the winter, additional heat was introduced into the kiva through both the use of a central hearth and the body heat of the inhabitants. The location of the kiva to the south of the roomblock also helped with the heating of the structure. Here, during the winter a small micro-climate was created. During the day the low winter sun was reflected back on the kiva from the room's vertical walls, and heat was concentrated in this relatively protected area. The roomblock also reduced heat loss from the kiva by blocking cold north winter winds.