Abstract: An air conditioner executes a heating operation using at least a high pressure refrigerant, and includes a refrigerant circuit configured to execute a vapor compression refrigeration cycle. The refrigerant circuit includes a convective heat exchanger, a radiant heat exchanger, an open/close valve and a check valve. The convective heat exchanger executes heat exchange between the high pressure refrigerant flowing inside and an air flowing towards outside. The radiant heat exchanger heats a predetermined member using the high pressure refrigerant flowing inside to cause the predetermined member to emit a radiant heat. The open/close valve is disposed upstream of the radiant heat exchanger in order to block a flow path of the high pressure refrigerant flowing towards the radiant heat exchanger during the heating operation. The check valve is disposed between the radiant heat exchanger and the open/close valve.

Abstract: The indoor unit comprises a body and a cover member. The body has a rear ledge. The rear ledge can be embedded in a wall. The cover member has a plurality of cover elements. The plurality of cover elements is aligned along the direction in which the rear ledge is embedded in a wall. The plurality of cover elements can be partitioned. The cover member covers at least part of the rear ledge.