Air conditioner efficiency is the more efficient the air conditioner.& powerful one.Minimum efficiency standards for residential appliances and lighting have been one of the most successful policies used by states and the federal government to save energy. Appliance efficiency.HVAC systems are comprised of the heating, air conditioning, and ventilation systems in a residential or commercial building. These mechanical systems provide thermal comfort and air quality in.Air conditioner efficiency is rated using the SEER(seasonal energy efficiency ratio) and EER(energy efficiency ratio) metrics. The higher these numbers are, the more efficient the air conditioner Air conditioner efficiency is rated using the SEER(seasonal energy efficiency ratio) and EER(energy efficiency ratio) metrics. The higher these numbers are, the more efficient the air conditioner.