Arrived to do a multi system performance maintenance. Set each system for cooling. Measured each systems static pressure measured a temperature split between return and supply air. Checked interior of the furnaces for cleanliness. Found that each systems blower wheel is coated in dust debris. Went outside and verified refrigerant levels. Verified operation of all electronic and mechanical components. Found that the contactor in the master bedroom system is charred. Found that the capacitor in the main floor system is failing. Rinsed coils free of debris. Spoke with homeowner about the system. Replaced all 3 filters in the systems. Air conditioning systems are operational at this time.