Air Conditioning Repair Certification (ETI) 2025 – 400 Free Practice Questions to Pass the Exam

High humidity levels can significantly impact the efficiency of an air conditioning system. When humidity is elevated, the air contains a higher amount of moisture, which leads to two primary challenges for the air conditioning process.

First, the air conditioning system must not only cool the air but also remove excess moisture to maintain comfort levels. This dual requirement forces the system to work harder. Instead of merely lowering the air temperature, the system's evaporator coil must engage in dehumidification, which involves removing moisture from the air. This process takes additional energy, causing the system to operate less efficiently overall.

Furthermore, when humidity is high, the air feels warmer than it actually is, leading to the thermostat set point potentially being adjusted lower to achieve the same level of comfort. This adjustment can further increase the workload on the air conditioning unit.

The other options do not accurately reflect the implications of high humidity on air conditioning efficiency. While air conditioning systems are designed to handle some level of moisture, excessive humidity generally requires increased energy expenditure rather than improved efficiency, a reduction in refrigerant needs, or preventing the compressor from operating.