Section 609
Required when repairing or servicing a motor vehicle A/C system for payment or bartering, regardless of refrigerant.
Section 608
Applies to building A/C, refrigeration, heat pumps, appliances, and other stationary equipment where refrigerant circuits are serviced.
609 or 608 Type II
EPA allows either certification route for qualifying farm, heavy-duty, construction, mining, and similar MVAC-like equipment.
Separate facility duties
Technician certification does not replace approved-equipment certification and shop recordkeeping.
What counts as consideration?
Payment includes non-cash exchange such as bartering. The rule does not depend on whether the customer paid with money.
Does every A/C-related task open the refrigerant circuit?
Not necessarily. Purely electrical, control, or cabin-air work may not involve refrigerant service. Define the task carefully and use EPA and employer guidance for the actual work.