Working at a two system home, performed AC maintenance, checked all electrical components and tightened all connections in indoor and outdoor units, checked amps, volts, pressures, blowers, heat, thermostats, batteries, float switches, vacuumed drain lines, rinsed condenser coil's and polished units, cleaned the interior and exterior of indoor units, installed new drain pan strips, filters, and new UV bulb in 5 ton air handler.