[Object] To obtain an indoor unit of an air-conditioning apparatus capable of activating a refrigeration cycle easily and quickly without requiring an operation on a remote controller or the like.

[Solution] An indoor unit 100 of an air-conditioning apparatus includes a controller 70 that controls a refrigeration cycle, an up/down air flow direction plate 9, and a left/right air flow direction plate 10, based on information of a person whose image is captured by an imaging device 50. When the refrigeration cycle is stopped, in a case where the face of the person detected by the imaging device 50 remains stationarily facing the imaging device 50 for a preset recognition time, the controller 70 recognizes the person as one wishing the refrigeration cycle to be activated, and activates the refrigeration cycle.

[Object] To provide a hot and cold water air conditioning system configured to restrict a heat pump heat source apparatus from performing an on/off cycle operation.

[Solution] The hot and cold water air conditioning system includes a water temperature sensor (5)configured to detect a temperature of water flowing out of the heat pump heat source apparatus (1) by an operation of the water circulation pump (4), and a controller (6) configured to perform, in a heating operation, on/off normal control that turns on a compressor (103) when the water temperature detected by the water temperature sensor (5) becomes lower than a target water temperature and turns off the compressor (103) when the water temperature becomes higher than a first temperature value higher than the target water temperature, and to switch from the on/off normal control, upon repeating the on/off operation of the compressor (103) at a minimum frequency necessary for an operation of the compressor (103) in the on/off normal control, to on/off restriction control that turns on the compressor (103) when the water temperature becomes lower than a second temperature value lower than the target water temperature and turns off the compressor (103) when the water temperature becomes equal to or higher than a third temperature value higher than the target water temperature.

To realize stable supply and demand adjustments in a management device that manages the energy consumption of heat pump systems of plural consumers. A management device manages plural heat pump systems to bring the total amount of energy consumed by the heat pump systems closer to the target value. The management device comprises a request transmitting unit, a consumption information receiving unit, a database, and a learning unit. The request transmitting unit transmits requested values of energy consumption to each of the heat pump systems. The consumption information receiving unit receives actual values of energy consumption from each of the heat pump systems. The database stores response characteristics (125) of consumers having each of the heat pump systems with respect to the requested values of energy consumption. The learning unit learns the response characteristics (125) and reflect learning results based on past records of responses of each of the consumers with respect to the requested values of energy consumption in the database.