An air-source heat pump air conditioner comprising: a first heat pump including a first refrigeration cycle that is formed by a first air-conditioning heat exchanger, a first heat-source heat exchanger, a first compressor, and a first circulating refrigerant flowing between and through the first air-conditioning heat exchanger, the first heat-source heat exchanger, and the first compressor; a second heat pump including a second refrigeration cycle that is formed by a second air-conditioning heat exchanger, a second heat-source heat exchanger, a second compressor, and a second circulating refrigerant flowing between and through the second air-conditioning heat exchanger, the second heat-source heat exchanger, and the second compressor; and an air conditioner control device configured to control the first heat pump and the second heat pump to operate at least one of the first refrigeration cycle and the second refrigeration cycle to adjust air-conditioning air to be in a suitable air condition for air conditioning of a space to be air conditioned, the air-conditioning air containing outside air and return air, that exchange heat with the first circulating refrigerant and the second circulating refrigerant in the first air-conditioning heat exchanger and the second air-conditioning heat exchanger, characterized in that the air conditioner control device includes a switching controller, and in a case where the air-conditioning air is adjustable to be in the suitable air condition by operating one of the first refrigeration cycle and the second refrigeration cycle, the switching controller: controls the first heat pump such that the outside air and the first circulating refrigerant exchange heat with each other in the first refrigeration cycle if a load of the outside air is greater than a preset load; and controls the second heat pump such that the return air and the second circulating refrigerant exchange heat with each other in the second refrigeration cycle if the load of the outside air is less than the preset load. a first heat pump including a first refrigeration cycle that is formed by a first air-conditioning heat exchanger, a first heat-source heat exchanger, a first compressor, and a first circulating refrigerant flowing between and through the first air-conditioning heat exchanger, the first heat-source heat exchanger, and the first compressor; a second heat pump including a second refrigeration cycle that is formed by a second air-conditioning heat exchanger, a second heat-source heat exchanger, a second compressor, and a second circulating refrigerant flowing between and through the second air-conditioning heat exchanger, the second heat-source heat exchanger, and the second compressor; and an air conditioner control device configured to control the first heat pump and the second heat pump to operate at least one of the first refrigeration cycle and the second refrigeration cycle to adjust air-conditioning air to be in a suitable air condition for air conditioning of a space to be air conditioned, the air-conditioning air containing outside air and return air, that exchange heat with the first circulating refrigerant and the second circulating refrigerant in the first air-conditioning heat exchanger and the second air-conditioning heat exchanger, controls the first heat pump such that the outside air and the first circulating refrigerant exchange heat with each other in the first refrigeration cycle if a load of the outside air is greater than a preset load; and controls the second heat pump such that the return air and the second circulating refrigerant exchange heat with each other in the second refrigeration cycle if the load of the outside air is less than the preset load.