Performed preventative maintenance for air conditioning system. Customer also was having issues getting air to the 2nd floor where the master bedroom is. Made some adjustments within the unit to increase the air flow upstairs. Other than a piece of furniture needing to be moved I got the 2nd floor cooling properly. Inspected all the electrical components. System takes 2- Merv 11 16x25x4 air filters that the customer will supply. We just installed 2 new air cleaners in March 2022. Confirmed proper high and low voltages. Tested the temperature split between the supply and return. System is operating at a 20° differential. System is operating properly at this time.