Reason for Air Conditioner Not Cooling: Insufficient Freon (also known as "Snow Seed" insufficient)

This is a normal situation, typically seen in air conditioners that are three to four years old. The air conditioner doesn't completely fail to cool but the cooling effect is insufficient. This is because older models use Freon as the refrigerant, which can evaporate over time. Additionally, there's a possibility of Freon leakage due to improper installation or inherent issues with the machine.

Reason Two for Air Conditioner Not Cooling: Insufficient Voltage Supply

Unstable power supply voltage often fails to reach normal levels, particularly during peak electricity usage times. Of course, this issue is clearly beyond the capabilities of a technically proficient air conditioner repairman. We must address the problem by ensuring a stable power supply.

What to do if the air conditioner doesn't cool: Maintain a normal power supply voltage or choose a variable-speed air conditioner. Why a variable-speed air conditioner can solve voltage issues can be found in the article "What Are the Benefits of Variable-Speed Air Conditioners - A Comprehensive List of the Advantages."

Reason Three for Air Conditioners Not Cooling: Insufficient Power

This is also one of the common reasons for no cooling, but the causes for this are diverse, such as: a low-power air conditioner for a large room, and in some cases, although the air conditioner's power seems to match the room size, the room may not be adequately sealed (like wide-open doors and windows), or there may be heat sources inside (such as multiple computers). Of course, west-facing glass in a greenhouse can also be a heat source, among other factors.