Performed cooling safety check. I checked amps, capacitor, electrical, drains, safeties, cleanliness, filters, temperature differential, and refrigerant temperature. The system is cooling well but the efficiency is being affected. I observed numerous issues. When the equipment was sold, the plenums were not included. This system needs new plenums because they are too small. This is resulting in a high static pressure and making the system seals come apart. High static pressure is a major issue and will result in a major system failure sooner. The system currently has an opening in supply side. This is causing the unit to cool the attic and may produce condensation. With past history, I recommended an additional float switch for more safety against potential water damage associated with the drains. The outdoor unit is missing pipe insulation on the suction line. This directly reduces efficiency making it cost more to run the unit. I observed some burn marks on the defrost board outdoor,