EPA 608 Certification: Which Type Do You Need?
A checker built on the definitions in 40 CFR 82.152 and the certification rule in 40 CFR 82.161, with the EPA text quoted below.
Which 608 type do I need?
Type II certification
- Type II: you work on medium-, high-, or very high-pressure appliances other than small appliances, MVACs, and MVAC-like appliances (40 CFR 82.161(a)(1)(ii)).
Rule text as published in the eCFR and on epa.gov, checked 2026-10-05.
Section 608 of the Clean Air Act sets the rules for people who work on stationary refrigeration and air conditioning equipment. EPA explains that it prohibits individuals from intentionally venting refrigerants "while maintaining, servicing, repairing, or disposing of air conditioning or refrigeration equipment." Under 40 CFR 82.161, any person who could be reasonably expected to violate the integrity of the refrigerant circuit must pass a certification exam for the kind of equipment they handle. The checker above applies the rule to your answers. The sections below quote the EPA and eCFR text it uses.
Worked examples
| Work | Equipment class | Certification |
|---|---|---|
| Repairing window air conditioners and household refrigerators | Small appliances | Type I |
| Servicing residential split systems that use R-410A or R-22 | High-pressure appliances | Type II |
| Servicing a chiller that uses R-123 | Low-pressure appliance | Type III |
| All of the above | Small, high-pressure and low-pressure appliances | Universal |
| Disposing of old window units only | Small appliances, disposal | Not required |
| Registered apprentice working under close and continual supervision | Any | Exempt while supervised |
The four certification types
"For servicing small appliances (Type I)."
"For servicing or disposing of high- or very high-pressure appliances, except small appliances and MVACs (Type II)."
"For servicing or disposing of low-pressure appliances (Type III)."
"For servicing all types of equipment (Universal)."
EPA, Section 608 Technician Certification Requirements
The regulation itself is more specific. Under 40 CFR 82.161(a)(1), "Persons who maintain, service, repair, or dispose of medium-, high-, or very high-pressure appliances (except small appliances, MVACs, and MVAC-like appliances) must be certified as Type II technicians," and "Persons who dispose of small appliances, MVACs, and MVAC-like appliances are not required to be certified." Motor vehicle air conditioners fall under 40 CFR part 82, subpart B, which implements section 609 of the Clean Air Act.
Pressure classes and example refrigerants
| Class | Definition | EPA examples | Type |
|---|---|---|---|
| Low-pressure | below 45 psia | R-11, R-123, R-113, R-245fa | III |
| Medium-pressure | between 45 psia and 170 psia | R-114, R-124, R-12, R-134a, R-500 | II |
| High-pressure | between 170 psia and 355 psia | R-22, R-407A, R-407C, R-410A, R-502 | II |
| Very high-pressure | critical temperature below 104 F, or above 355 psia | R-13, R-23, R-503, R-508A, R-508B | II |
| Small appliance | fully manufactured, charged, and hermetically sealed in a factory with five (5) pounds or less of refrigerant | Refrigerators, room air conditioners, dehumidifiers, vending machines | I |
A pressure of exactly 45 psia counts as medium pressure, because the low-pressure class is "below 45 psia." A pressure of exactly 170 psia sits on the line between medium and high pressure, and both of those classes call for Type II, so the answer does not change.
Who counts as a technician
EPA lists the activities that make someone a technician: "Attaching and detaching hoses and gauges to and from an appliance to measure pressure within the appliance," and "Adding refrigerant to or removing refrigerant from an appliance." The definition in 40 CFR 82.152 adds adding or removing components and cutting the refrigerant line. Work such as "painting the appliance, rewiring an external electrical circuit, replacing insulation on a length of pipe, or tightening nuts and bolts" is not reasonably expected to release refrigerant.
Some substitute refrigerants are exempt in listed end-uses. Under 40 CFR 82.154(a)(1), "the following substitutes in the following end-uses are exempt from this prohibition and from the requirements of this subpart," for example isobutane (R-600a) in household refrigerators and freezers. Check that list before you assume a rule does or does not apply.
How the tests work
- "Technicians are required to pass an EPA-approved test to earn Section 608 Technician Certification." The tests are specific to the type of equipment you work on.
- "Tests must be administered by an EPA-approved certifying organization." EPA does not issue certification cards.
- Each test has at least 25 core questions and at least 25 questions from each relevant technical group (40 CFR 82.161(c)).
- "Section 608 Technician Certification credentials do not expire." Keep a copy of your certificate at your place of business (40 CFR 82.161(a)(4)).
Frequently asked questions
What are the four EPA 608 certification types?
EPA lists Type I for servicing small appliances, Type II for servicing or disposing of high- or very high-pressure appliances except small appliances and MVACs, Type III for low-pressure appliances, and Universal for servicing all types of equipment.
Does EPA 608 certification expire?
No. EPA says Section 608 Technician Certification credentials do not expire.
Which 608 type do I need for residential air conditioning?
Central split systems that use refrigerants such as R-410A or R-22 are high-pressure appliances under 40 CFR 82.152, so they call for Type II. Window, portable, and other factory-sealed room units with five pounds or less of refrigerant are small appliances, which call for Type I.
Do apprentices need EPA 608 certification?
Apprentices are exempt while they are closely and continually supervised by a certified technician. Under 40 CFR 82.152, a person may only be an apprentice for two years from the date of first registering.
Who gives the EPA 608 test?
Tests must be administered by an EPA-approved certifying organization. EPA itself does not issue certification cards.
What does the Universal test require?
EPA says the core test must be taken as a proctored exam to attain Universal certification. Each test must include at least 25 questions from the core group and at least 25 from each relevant technical group (40 CFR 82.161(c)).
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Sources
- BLS Occupational Outlook Handbook: Heating, Air Conditioning, and Refrigeration Mechanics and Installers. Read from an Internet Archive copy dated September 30, 2026 because the agency site blocks automated access.
- EPA: Stationary Refrigeration and Air Conditioning (Section 608).
- EPA: Section 608 Technician Certification Requirements.
- EPA: Section 608 Technician Certification.
- EPA: Section 608 Test Topics.
- eCFR: 40 CFR 82.30, Purpose and scope of subpart B.
- eCFR: 40 CFR 82.161, Technician certification.
- eCFR: 40 CFR 82.152, Definitions.
- eCFR: 40 CFR 82.154, Prohibitions.