1. Selection of cooling capacity: In order to make the air conditioning economical and practical, the appropriate cooling capacity should be selected. Generally, the room with a size of about square meters should be selected from 1600-2000 kcal/hour air conditioner. For rooms with an area of 20-30 square meters, 3,000 kcal/hour air conditioners should be selected. For rooms with an area of 40-50 square meters, 4,500 kcal/hour air conditioners should be selected. At the same time, we must also consider the conditions of sunshine, the height of the house and the population.

　　2. Selection of variety models: (1) There are windows facing outwards, the structure is sturdy, suitable for ventilation, and window air conditioners should be selected. (2) There is no outward facing window, or the structure of the window basket is not suitable; it pays attention to the appearance, requires the air conditioner to be installed in a less conspicuous place; if it is not suitable for window air conditioner, it should choose a split type air conditioner.

　　3. Good quality and low price: Under the same function, the price should be low. Under the same price conditions, it should be beautiful and elegant.

　　4. Energy-saving products should be used as much as possible. Because air conditioners consume more power than other home appliances. Therefore, under the premise that the function meets the needs, the less power consumption is more economical.