|Voted Best Answer
Are the heat pumps commercial or residential units?
Are the heat pumps Package or Split System?
Are there actually 33 PTAC units?
Are you an EPA certified person( refrigerant )?
Here is my suggestion, break it down into manageable portions(ie one heat pump and a few PTAC units every other month) to keep from being overloaded.
Check/inspect electrical wiring and connections
Check amperage draw of compressors/motors
Check capacitance of start and run capacitors
Check contractors/relays for wear/pitting
Check refrigerant levels and record superheated/subcooling
Check external static pressures across air handler(s)
Check deltaT (return and supply air temps)
Lubricate motors( if applicable)
Inspect Belts/Pulleys( if applicable)
Clean outdoor coils
Clean indoor coils
Start there and HAVE FUN!!!