Duct leakage exceeded 150 CFM 50 in 70% of the systems.
Disconnected ducts were found in 31% of the systems.
Air flow measured across the indoor coil was deficient by more than 50 CFM/Ton on 48% of the systems.
Air discharged from the outdoor coil was recirculated back through the coil due to obstructions in 18% of the system.
Systems were found to be undercharged in 31% of the sample. Sixty-nine percent of units had either correct charge or were overcharged.
Refrigerant leaks were found in 20% of the systems.