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

This is a normal situation, usually occurring in air conditioners that are three to four years old. The air conditioner doesn't stop cooling entirely, but the cooling effect is insufficient. This is because older models use Freon as the refrigerant, which can evaporate over time. Additionally, it's not ruled out that improper installation could lead to Freon leakage or inherent issues with the machine.

Reason Two for Air Conditioners Not Cooling: Insufficient Voltage Supply

The power supply voltage is unstable, often failing to reach normal levels, especially during peak electricity usage times when this issue tends to occur more frequently. Of course, this problem is clearly beyond the scope of a technically skilled air conditioner repairman. We must address the issue 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-frequency air conditioner. Why a variable-frequency air conditioner can solve the voltage issue can be found in the article "What Are the Benefits of Variable-Frequency Air Conditioners - A Comprehensive List of the Advantages."

Three Reasons for Air Conditioners Not Cooling - Insufficient Power Rating

This is also one of the common reasons for no cooling, but the causes for this non-cooling can be varied, such as: a low-power air conditioner in a large room, or in some cases, although the air conditioner's power seems to match the room size, the room may not be well-sealed (like open doors and windows), or there might be heat sources inside (such as many computers), of course, west-facing glass rooms can also be a source of heat, etc.