PROBLEM TO BE SOLVED: To propose a useful warning system in daily life.SOLUTION: The warning system gives a warning with a habitable room temperature sensor and a dressing room temperature when temperature difference between a habitable room and a dressing room is equal to or more than a prescribed level. A warning part warns that the dressing room temperature is equal to or less than the prescribed level regardless of the temperature difference between the habitable room and the dressing room. A heating part is made to function when the temperature difference between the habitable room and the dressing room is equal to or more than the prescribed level. The heating part makes the heating part function due to bath preparation of a bathtub. The heating part makes the heating part function on the basis of a human sensor. The warning part gives a warning on the basis of the human sensor. Whether to correspond to the warning by the warning part is determined. A determination result of a determination part is reco
