Air Conditioning Repair Certification (ETI) Practice Exam

Higher than normal energy bills can be a significant indicator of inadequate refrigerant levels in an air conditioning system. When refrigerant levels are low, the system has to work much harder to achieve the desired cooling effect. This increased workload places additional strain on the compressor and other components, leading to higher energy consumption. Consequently, this can result in noticeably elevated energy bills when compared to typical expenses during periods of normal system operation.

The other options do not correlate with low refrigerant levels in the way that energy bills do. Consistent air output temperature might suggest that the system is functioning adequately, while even unit operation indicates that the system is running smoothly and effectively. Improved indoor air quality would not be a sign of low refrigerant; rather, it pertains to the filtration and circulation capabilities of the air conditioning system, which would not be directly impacted by refrigerant levels.