Delta T is 26 degrees. Delta T should be between 17-21 degrees. Delta T is being affected by no load on the indoor and outdoor system due to cool temperatures. Indoor heat transfer system is clean. Air circulation system is clean. All electrical connections are tight. Flushed water removal system with hot water. Purged water removal system with CO2. Indoor voltage enhancement system is within spec. Sprayed heat transfer system with cleaner. Leak searched indoor heat transfer system and found no leaks. Mold is starting to build up on the air filter. This will eventually lead mold build up on the indoorheat transfer system causing the system to work harder and contaminate the breathing air. Outdoor heat transfer system is dirty. Sprayed off outdoor heat transfer system. RLA and FLA are within factory spec. Outdoor voltage enhancement system is within factory spec. Electrical gateway in not pitted or burned. Removed leaves from bottom of outdoor system. Operation normal at