The absorption heat pump device is used in an air conditioner including a desiccant. The absorption heat pump includes a heat pump unit 1 and a heat pump unit 2 to provide heat generated from thermal action of the heat pumps including the heat of condensation of the refrigerant and the heat of absorption from the concentrated solution for heating regeneration air taken from an outside environment and a quantity of heat extracted from a low temperature heat transfer medium to produce an intermediate temperature hot water of about 60.degree..about.80.degree. C. The heat pump device also provides chilled water of about 15.degree. C. temperature, for use in cooling process air. The judicious use of heat provided by the absorption heat pump enables to achieve a high level of energy conservation for performing desiccant assisted air conditioner which operates at high efficiency.