Abstract: A humidifier for use with counter- or down-flow furnaces such as those traditionally found in mobile homes. The humidifier includes a louvered tip-out access door, behind which is housed a drawer containing a water panel. The drawer is detachably snap-fitted to the inside of the access door. Water is directed onto the water panel by a water dispersion bar, which is snap-fitted into the top of the drawer above the water panel. As air is drawn through the humidifier which is installed over the return air louvers of a counter-flow furnace, tiny water droplets in the water panel are picked up by the moving air stream and carried into the home. The tip-out feature of the access door and the snap-fit connections allow for simple, easy repair and cleaning, even by an untrained person, thus avoiding the need for a skilled technician when only routine maintenance is necessary.