First of all, the cooling load of the room is calculated. The air conditioning cooling load refers to the amount that must be taken away from the room by the air conditioner at a certain time in order to maintain the set temperature of the room. The cooling load of an air-conditioned room is formed by indoor heat. However, heat gain and cooling load are two different concepts and are related to each other. The heat gain of a room refers to the sum of heat entering the room from outdoor and indoor heat sources at a certain time.