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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. Clean/Replace filters 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!!!
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