Two separate federal regulations. Two separate exams. Two separate sets of rules. If you are entering the trades or expanding your certification, knowing which one applies to your work is the first step.
Here is the clean breakdown.
EPA 608: stationary refrigeration and air conditioning
Section 608 of the Clean Air Act regulates stationary refrigeration and air conditioning equipment — equipment that does not move around.
Covered equipment includes:
- Residential split systems (heat pumps, central A/C)
- Light commercial packaged rooftop units
- Commercial refrigeration cases and walk-in coolers
- Chillers (centrifugal, reciprocating, screw)
- Industrial process refrigeration
- Dehumidifiers, window units, and other small appliances
The regulation prohibits venting of ozone-depleting and high-global-warming-potential refrigerants and requires technician certification to purchase and handle covered refrigerants. Recovery before service or disposal is mandatory.
EPA 608 has four certification types:
- Type I: Small appliances (5 lbs or less, hermetically sealed)
- Type II: High-pressure systems (R-22, R-410A, R-404A, and similar refrigerants)
- Type III: Low-pressure systems (R-11, R-113, R-123 — large centrifugal chillers)
- Universal: All three types, valid for all covered equipment
If you are working as an HVAC technician on any of the above equipment, you need EPA 608. The certification does not expire and is recognized nationally.
EPA 609: motor vehicle air conditioning
Section 609 of the Clean Air Act regulates motor vehicle air conditioning (MVAC) systems — the A/C in cars, trucks, vans, and other on-road vehicles.
The rules differ from 608 in several ways:
Refrigerant: Most automotive A/C systems use R-134a (older vehicles) or R-1234yf (newer vehicles, post-approximately 2015). R-134a is an HFC — not ozone-depleting, but a high-GWP greenhouse gas. R-1234yf is an HFO with a very low GWP.
Equipment: MVAC systems are closed, compact, and serviced with equipment designed specifically for automotive use. Recovery machines for automotive A/C are different from the machines used on commercial HVAC equipment.
Technician certification: EPA 609 certification is required to purchase refrigerants in containers of 2 pounds or more for MVAC use. Automotive technicians who handle refrigerant in shop settings must be certified. The certification covers proper recovery, recycling, and leak testing for automotive A/C.
No universal tier: Unlike 608, there is no Universal tier for 609. There is one certification covering all motor vehicle A/C work.
Who needs which
HVAC technician working on stationary equipment only: EPA 608 (Type II or Universal for most techs). No 609 required.
Automotive technician working on car A/C only: EPA 609. No 608 required.
Fleet maintenance technician servicing both HVAC equipment and vehicle A/C: May need both. This is more common in settings like military installations, large logistics facilities, or industrial plants where the maintenance team covers everything.
Refrigeration technician at a grocery chain: EPA 608 — probably Universal given the mix of equipment types. No 609 required.
HVAC apprentice just entering the field: Start with EPA 608. Take Universal if you can — the cost and time difference over Type II alone is minimal, and Universal covers everything.
The refrigerants are different
This is worth understanding because the regulations exist specifically to control which refrigerants get released into the atmosphere.
608 refrigerants include ozone-depleting HCFCs (like R-22, which is in its final production phase-out) and high-GWP HFCs (like R-410A, R-404A). The phase-out of R-410A under the AIM Act means the industry is transitioning to lower-GWP alternatives like R-454B and R-32.
609 refrigerants include R-134a (HFC, high GWP) and R-1234yf (HFO, very low GWP). The automotive industry has largely transitioned to R-1234yf for new vehicles, driven by European regulations that took effect in 2011 and U.S. follow-on standards.
Recovery equipment, cylinder types, and handling procedures are designed around these specific refrigerants. You cannot mix them — using automotive A/C recovery equipment on a commercial rooftop unit is a regulatory violation and a safety issue.
What about commercial vehicles?
Trucks, buses, and other on-road vehicles with A/C fall under EPA 609 even if the vehicle is commercial. The line is whether the equipment is stationary or mobile.
The exception: refrigerated transport units (the refrigeration systems on the back of refrigerated trailers) are not MVAC systems. They are stationary refrigeration equipment that happens to be mounted on a vehicle. Those fall under EPA 608.
This distinction catches some technicians off guard. If you service transport refrigeration units, you need EPA 608, not 609.
Study requirements
EPA 608 Universal typically requires 15–25 hours of focused study covering four sections:
- Core section: ozone science, refrigerant regulations, safety, regulatory history
- Type I: small appliance specifics
- Type II: high-pressure system recovery, evacuation, leak repair
- Type III: low-pressure system specifics
Passing score: 70% on each section. Sections can be passed independently — you can take Core and Type II only if that is all you need.
EPA 608 prep at epa608study.com covers all four sections, 225 questions, and 52 structured lessons. Available in English and Spanish. $14.99 one-time.
EPA 609 is a separate exam with a shorter study requirement, focused specifically on MVAC procedures. There is no 609 content in the epa608study.com app — if you need 609 certification, seek out MVAC-specific study materials and testing through an EPA-approved 609 testing organization.
The short answer
If you are studying for an HVAC career or working on stationary refrigeration equipment: EPA 608 is what you need.
Start with the free practice test at epa608study.com to see where you stand on the Core section. Full prep for all four sections is $14.99 — one exam, one purchase, certification for life.
EPA 609 is a different certification for a different type of work. If that is your path, you will need different study materials. But if you are here because you are prepping for HVAC work, you are in the right place.
Frequently Asked Questions
- What is the difference between EPA 608 and EPA 609?
- EPA 608 covers stationary refrigeration and air conditioning equipment — split systems, rooftop units, chillers, commercial refrigeration cases, and similar HVAC equipment. EPA 609 covers motor vehicle air conditioning (MVAC) systems — the A/C systems in cars, trucks, and other motor vehicles. The two certifications are separate because the equipment, refrigerants, and recovery procedures differ significantly.
- Do I need EPA 608 or EPA 609 to work on car air conditioning?
- You need EPA 609 certification to purchase refrigerants used in motor vehicle A/C systems and to service those systems legally. EPA 608 certification does not cover automotive A/C work.
- Do I need both EPA 608 and EPA 609?
- Only if your work spans both stationary HVAC equipment and motor vehicle A/C systems. Pure HVAC technicians who do not touch automotive A/C only need EPA 608. Pure automotive techs who do not work on stationary equipment only need EPA 609. Technicians at shops that do both — some fleet maintenance operations, for example — may need both.
- Which certification is harder to get?
- EPA 608 Universal is generally considered more comprehensive and requires more study time. The exam covers four sections (Core, Type I, Type II, Type III) with detailed regulatory knowledge required. EPA 609 certification is typically a shorter exam focused on automotive A/C systems and motor vehicle-specific refrigerant handling.
- Where can I get EPA 608 certified?
- EPA 608 exams are offered by EPA-approved testing organizations across the country. Some organizations offer online proctored exams. epa608study.com offers practice tests for all four sections to help you prepare.