The agent and buyer met me at the home and we briefly went over the inspection report. The inspector was unable to turn on the heating and cooling of the outdoor heat pump. Therefore I began to diagnose the unit and look for the issue. I first checked and verified the unit was sending proper power. Once I confirmed the unit was sending power I found the unit to be in a lockout on the compressor. I connected my gauges and found the system to be completely empty. The outdoor heat pump holds an outdated refrigerant that does not match the indoor air handler unit properly. Both types of refrigerant are currently being faced out and a full system replacement is recommended, one that matches equipment and refrigerant and brings everything up to code.