Performed preventative maintenance tune up. Checked blower motor operation and inspected equipment cabinet. Checked thermostat calibration and filter location. Customer has replaced filter. Checked safety float switch and inspected drain line. Cleaned vacuumed drain pan and drain line. Flushed drain line with water and primed drain line. Checked condensate pump and vacuumed condensate pump box. Checked ductwork connections and inspected attic insulation. The attic insulation is poor and highly recommend adding insulation in attic to help reduce electricity bills and keep unit cooling properly. Checked refrigerant levels and check test start up components. The capacitor has tested good and working properly. Test system in heat mode checked discharge temperature and blower motor operation. Removed debris from condenser unit and rinse condenser coil and compressor deck. Checked refrigerant levels. Unit is slightly low on refrigerant in the system recommended adding refrigerant to keep uni