Difference between EPA 608 and 609: which certification do you need?

EPA 608 vs 609: side by side

Both certifications exist under the Clean Air Act, but under entirely different sections and different subparts of 40 CFR Part 82. The equipment category, not the refrigerant, determines which certification applies.

Feature	EPA 608	EPA 609
Clean Air Act section	Section 608	Section 609
CFR reference	40 CFR Part 82, Subpart F	40 CFR Part 82, Subpart B
Equipment covered	Stationary refrigeration and AC (commercial HVAC, industrial refrigeration, walk-in coolers, residential HVAC, low pressure chillers)	Motor vehicle AC (MVAC) in vehicles under 8,500 lbs GVWR (cars, light trucks, passenger vans)
Certification types	Core, Type I (small appliances, 5 lbs or less), Type II (high pressure), Type III (low pressure), Universal (all)	Technician certification plus separate equipment certification
Exam format	4 sections, 25 questions each (100 total for Universal), proctored	Single technician exam, open book format permitted
Passing threshold	72% (18 of 25) per section, proctored	84% (21 of 25) for open book technician exam
Substitutes for the other?	NO	NO
Permanent (no expiration)?	Yes	Yes

What EPA 608 covers

EPA 608 is the certification for stationary refrigeration and air conditioning equipment. It applies whenever you purchase refrigerant in containers over 2 lbs or perform any service that involves opening a refrigerant circuit on a stationary appliance.

EPA 608 has four types covering different pressure classes of equipment:

• Core: mandatory for all candidates, covers regulations, the venting prohibition, penalties, and refrigerant definitions. Core alone authorizes no equipment.
• Type I: small appliances with 5 lbs or less manufactured charge (window ACs, household refrigerators, vending machines). The only section available in an open book mail in format.
• Type II: high pressure systems (residential split systems, rooftop units, commercial refrigeration, R-22, R-410A, R-454B). The level most HVAC technicians need.
• Type III: low pressure centrifugal chillers (R-11, R-123). Found in large commercial buildings and industrial facilities.
• Universal: all four sections combined (100 questions total), scored independently per section at 72% each.

EPA 608 does NOT cover motor vehicle air conditioning. A technician holding Universal 608 certification who services a car's AC system without EPA 609 certification is in violation of federal law.

What EPA 609 covers

EPA 609 covers motor vehicle air conditioning (MVAC) systems in vehicles under 8,500 lbs gross vehicle weight rating (GVWR). That means passenger cars, light trucks, SUVs, and passenger vans in that weight class.

EPA 609 certification has two parts:

• Technician certification: the individual who services MVAC systems must hold certification. The exam may be taken in open book format.
• Equipment certification: the recovery and recycling equipment used must be certified separately by an SAE-approved organization. This applies to the shop or employer, not just the technician.

The refrigerants in MVAC systems (R-134a and R-1234yf) fall under Section 609 requirements when they are in a vehicle, not Section 608. The same R-134a in a stationary refrigeration system switches to EPA 608 jurisdiction. The certification follows the equipment category, not the refrigerant identity.

Which certification do you need?

The answer depends entirely on the equipment you service:

You work on stationary HVAC and refrigeration only (building systems, walk-in coolers, commercial refrigeration): you need EPA 608. EPA 609 is not required and does not apply to your work.

You work on car AC only (auto shop, dealership, fleet vehicle AC): you need EPA 609. EPA 608 is not applicable to MVAC systems and does not satisfy the 609 requirement.

You service both stationary equipment and vehicle AC (mobile mechanic shops, facility maintenance with fleet vehicles, shops that handle both): you need both EPA 608 and EPA 609. There is no combined exam and no shortcut. The Clean Air Act regulations are specific: each equipment category has its own certification requirement.

Exam differences: 608 vs 609

EPA 608 exam structure: four independent sections, each 25 questions. You must pass each section at 72% (18 of 25) to earn that type certification. Universal requires passing all four sections. Core must be taken proctored (the open book Core mail in format cannot count toward Universal). Exams are administered by EPA-approved certifying organizations such as ESCO Group, Mainstream Engineering, and HVAC Excellence.

EPA 609 exam structure: a single technician certification exam. Open book format is permitted for the technician exam, with a passing threshold of 84% (21 of 25). The equipment used for refrigerant recovery and recycling must be separately certified. Exams are administered by EPA-approved automotive industry organizations.

The two exam systems have no overlap. There is no exemption, no waiver, and no combined pathway. Passing EPA 608 Universal does not reduce the requirements for EPA 609, and vice versa.

Refrigerants covered: 608 vs 609

The refrigerant alone does not tell you which certification applies. The equipment category determines the regulation.

Refrigerant	Common application	Certification required
R-22 (HCFC)	Older residential and commercial AC	EPA 608
R-410A (HFC)	Modern residential split systems (banned for new equipment Jan 1, 2025)	EPA 608
R-454B (A2L blend)	New HVAC systems replacing R-410A	EPA 608
R-32 (HFC, A2L)	Next generation residential AC	EPA 608
R-123 (HCFC)	Low pressure centrifugal chillers	EPA 608
R-134a in stationary equipment	Reach-in coolers, some chillers	EPA 608
R-134a in vehicle AC	Cars and light trucks (older models)	EPA 609
R-1234yf	Modern vehicle AC (replacing R-134a in cars)	EPA 609

Which certification by career path

HVAC service technician (residential or commercial)

You need EPA 608, specifically Type II or Universal. Type II covers most residential and commercial HVAC equipment (split systems, rooftop units, heat pumps using R-22, R-410A, R-454B). Universal adds Type I small appliances and Type III chillers. Most commercial HVAC employers require Universal as a standard condition of employment. EPA 609 is not required unless you also service vehicle AC.

Commercial refrigeration technician (walk-ins, display cases)

You need EPA 608. Walk-in coolers and display cases are stationary equipment under Section 608. The type you need depends on the equipment charge size: Type I if under 5 lbs, Type II for most commercial refrigeration systems. Universal covers everything.

Auto AC mechanic

You need EPA 609, plus your shop's recovery equipment needs to be certified. EPA 608 does not apply to your work unless you also service stationary HVAC at your shop (which would require 608 separately).

Chiller technician (large commercial or industrial)

You need EPA 608 Type III or Universal. Centrifugal chillers using R-123 or legacy CFCs fall under Type III (low pressure). Universal covers Type III along with all other stationary equipment categories.

General maintenance technician (building facilities)

You likely need EPA 608 Type II for HVAC maintenance. If your role includes servicing fleet or vehicle AC, you also need EPA 609. If the facility has large centrifugal chillers, add Type III or get Universal.

Frequently asked questions