Fireplaces
Many fireplaces still remain in rooms, but the majority are found in convenient corners of the plazas[34]. The most common situation is in an angle formed by two walls; in which case the fire-pit is generally rimmed with a slightly elevated rounded ridge of adobe. In room 84 there is a fireplace in the middle of the floor. At one side of this depression there extends a supplementary groove in the floor, rimmed with stone, the use of which is not known. Although fireplaces are ordinarily half round, a square one occurs in the northwestern corner of room 81. All the fireplaces contained wood ashes, sometimes packed hard; but no cinders, large fragments of charcoal, or coal ashes were evident. The sides of the walls above the fireplaces are generally blackened with smoke.
The fire-holes of the kivas, being specially constructed, are different in shape from those in secular houses. While the cooking fire-pits are generally shallow, kiva fire-holes a foot deep are not exceptional, and several are much deeper. The fire was kindled in the kiva not so much for heating the room, as for lighting it, there being no windows for that purpose. Certain kinds of fuel were probably prescribed, but logs were not burned in kivas on account of the heat. No evidences of smoke-hoods or chimneys have been found in any of the Cliff Palace rooms. The walls of many kivas showed blackening by soot or smoke.