Low suction pressure in an air conditioning system can be caused by which factor?

Low suction pressure in an air conditioning system typically indicates that the evaporator is not absorbing enough heat from the air being circulated through the system. One primary factor that can lead to low suction pressure is having low refrigerant levels, which is commonly recognized as a critical cause of this issue.

When refrigerant levels are low, there is insufficient refrigerant to absorb heat effectively, leading to a drop in pressure within the evaporator. The refrigerant must circulate through the entire system at the correct levels to maintain proper cooling and pressure. If the refrigerant is too low, it can result in inadequate cooling and increased suction pressure, which can manifest as inefficiency in the system’s operation.

While oversized ductwork can lead to poor airflow and potential airflow issues, it does not directly cause low suction pressure. Similarly, damaged evaporator coils can reduce the effectiveness of heat exchange, but the effect on suction pressure would depend on the extent of the damage and other factors. Undersized ductwork typically restricts airflow, which can lead to high suction pressure instead of low suction pressure. Therefore, low refrigerant levels is the most accurate choice in the context of this question, directly correlating with the problem of low suction pressure in an air conditioning system.