What is the typical temperature difference across the evaporator coil in a functioning AC system?

The typical temperature difference across the evaporator coil in a functioning air conditioning system is generally between 15 to 20 degrees Fahrenheit. This temperature difference, known as the TD (temperature differential), is crucial for efficient heat transfer. It indicates the cooling capacity of the system and ensures that the refrigerant inside the evaporator coil adequately absorbs heat from the indoor air.

When the refrigerant enters the evaporator coil, it is in a low-pressure, low-temperature state. As warm indoor air passes over the coil, the refrigerant absorbs heat, causing it to evaporate and cool the air before it is circulated back into the living space. A temperature difference within this range indicates that the system is operating efficiently without being overly stressed, which could occur with a greater TD. Maintaining this specific temperature difference helps in achieving optimal performance and energy efficiency, thereby extending the lifespan of the equipment and providing better comfort within the conditioned space.