Working on A/C maintenance, checked all electrical components and tightened all connections in indoor and outdoor units, checked amps, volts, pressures, blower, heat, thermostat, batteries, humidistat, float switches, vacuumed drain line, rinsed condenser coil and polished unit, cleaned the interior and exterior of indoor unit with disinfectant, installed new drain pan strip, installed customer supplied filter and batteries in thermostat.