prim - purg
- primary air
- primary coolant
- primary fluid
- primary refrigerant
- primary surface
- primary test method
- primary transfer fluid
- primary-alternate test method
- prime contractor
- prime mover
- prime professional
- prime surface
- principle
- printer
- printing plant
- printout
- process
- process air conditioning
- process control
- process hot water
- produce
- product integral control
- product integrated control
- product safety
- professional engineer
- programmable read-only memory
- programming control
- project architect
- project engineer
- PROM
- proof test
- propeller fan
- property
- proportional band control
- proportional control mode
- propylene glycol
- PRV
- psia
- psig
- psychrometer
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