Heat source unit and air conditioner having the heat source unit

A heat source unit for an air conditioner that comprises a refrigerant circuit, the heat source unit comprising:

• an external housing that accommodates:
• a compressor connected to the refrigerant circuit;
• a heat source heat exchanger that is connected to the refrigerant circuit and that exchanges heat between a refrigerant circulating in the refrigerant circuit and a heat source;
• and
• an electric box that:
• includes a top wall and a plurality of side walls;
• accommodates electrical components that control the air conditioner;
• and
• further includes an air passage comprising an air inlet and an air outlet, wherein an air flow is induced through the air passage from the air inlet to the air outlet for cooling at least some of the electrical components;
• and
• a cooling heat exchanger that is disposed in the external housing and that is connected to the refrigerant circuit, wherein
• the air flow flows through the cooling heat exchanger, and
• the cooling heat exchanger exchanges heat between the refrigerant and the air flow.