Abstract: By providing a completely enclosed air heating and exchanging system which is quickly and easily mounted in a conventional fireplace and which incorporates a humidification unit, a unique fireplace heater, circulator and humidifier system is provided. In the preferred embodiment, the heater, circulator and humidifier system is mounted along the upper edge of the open fireplace hearth with the air circulation chamber of the system extending into the fireplace heating zone and a fan for driving the air through the system. Furthermore, if desired, the unit may incorporate a thermostat control for cycling the fan motor on and off to a desired temperature.