I arrived to do a scheduled maintenance agreement cooling tune up on a Carrier 13 SEER 2.5 Ton Air Conditioner. I visually inspected the unit and found that the Delta T was a 13.9 which is a little low. Than I noticed the supply Ductwork all came together into one big box and could be causing some turbulence. Customer had dogs and did not want me to check the filter inside the house. Customer advised me that the filter was brand new. Refrigerant pressures and sub cool we’re within range. System appears to be operating within manufacture specs. System was operating upon my departure .
