An AC (air conditioning) evaporator and a freezer evaporator serve different purposes and operate under different design considerations. While it might seem intuitive to make an AC evaporator as cold as a freezer evaporator to cool a room faster, there are important reasons why this is not the case.
Cooling Capacity and Efficiency: The primary function of an air conditioner is to cool a room or indoor space to a comfortable temperature, typically between 20-25°C (68-77°F), depending on the user's preference. On the other hand, a freezer's goal is to maintain temperatures significantly below freezing (typically around -18°C or 0°F). Designing an AC evaporator to reach freezer-like temperatures would be inefficient and unnecessary for cooling a room comfortably.
Dehumidification: Air conditioners not only cool the air but also remove excess humidity from the indoor environment, which is essential for comfort. An excessively cold evaporator could lead to frost forming on the evaporator coils, reducing the unit's ability to dehumidify the air effectively.
Energy Consumption: Running an AC evaporator at freezer-like temperatures would require significantly more energy, leading to higher electricity bills and wasteful energy usage. AC systems are designed to strike a balance between cooling efficiency and power consumption.
Frost and Ice Formation: When an evaporator becomes too cold, moisture from the air can freeze on its surface. This can lead to reduced airflow and decreased cooling efficiency, as well as potential damage to the system due to ice buildup. Freezer evaporators are designed to handle frost and ice buildup, while AC systems are not intended for this purpose.
Comfort and Health: Extremely low temperatures are not suitable for human comfort and can lead to discomfort and health issues. Prolonged exposure to excessively cold air can cause dry skin, respiratory problems, and other health concerns.
In summary, AC evaporators are designed to cool indoor spaces to a comfortable temperature while removing humidity efficiently. They are not intended to reach the extremely low temperatures required for freezing, as doing so would lead to inefficiencies, frost and ice problems, higher energy consumption, and discomfort for occupants. If you need freezing temperatures for specific purposes, a freezer is the appropriate appliance designed for that specific task.