| Aspect | 91331 | 91332 |
|---|
| Required Certifications | Basic certifications in HVAC or refrigeration | Advanced HVAC certifications, possibly including EPA or state-specific licenses |
| Work Environment | Residential and light commercial settings | Commercial, industrial, or specialized refrigeration environments |
| Industry Usage | Commonly used in residential HVAC services | More prevalent in commercial refrigeration and HVAC systems |
While both 91331 and 91332 involve HVAC and refrigeration work, 91332 typically requires more advanced certifications and is used in more complex commercial settings. 91331 is suited for residential and light commercial tasks, whereas 91332 is geared toward specialized, large-scale systems.