Air-conditioning apparatus

An air-conditioning apparatus comprising:

• a plurality of outdoor units through which refrigerant flows, the plurality of outdoor units each including a compressor and an outdoor heat exchanger;
• at least one indoor unit through which a heat medium flows, the at least one indoor unit including an indoor heat exchanger;
• a plurality of relay devices to which the plurality of outdoor units are connected independently, and to which the indoor unit is connected, each of the plurality of relay devices including a heat medium heat exchanger configured to exchange heat between the refrigerant and the heat medium;
• and
• a controller configured to control action of the plurality of outdoor units, the indoor unit, and the plurality of relay devices,
• the controller being configured to
• determine necessity for a defrosting operation for each of the plurality of outdoor units,
• compare an indoor unit total load with an outdoor unit total capacity, in a case where the defrosting operation is necessary, the indoor unit total load indicating an air conditioning load during a heating operation, the outdoor unit total capacity indicating a capacity of an other outdoor unit excluding a target outdoor unit where the defrosting operation is necessary, and
• control an operating frequency of the compressor of the other outdoor unit to increase the outdoor unit total capacity in a case where the indoor unit total load is greater than the outdoor unit total capacity as a result of a comparison.