EPA Section 608 certification is federal law, not a nice-to-have: any technician who maintains, services, repairs or disposes of equipment that could release refrigerant must hold it, and only certified technicians may buy refrigerant. It comes in four types that are not interchangeable, and it never expires. It is not the same as NATE, which is voluntary, taken by specialty, and renewed every two years. If you write "EPA certified" on a requisition without naming a type, you have not said what you need.
What do the EPA 608 types actually cover?
The quoted definitions are EPA's own wording, read on 27 October 2026. The second column is what that means on a commercial site. A card of one type does not cover another type's equipment.
Small appliances - the sealed, factory-charged units. On a commercial site this is the vending machines, the water coolers and the under-counter refrigeration, not the rooftop units and not the chiller.
The bulk of commercial work: rooftop units, split systems, heat pumps, supermarket racks, most process cooling. If you are hiring a commercial service technician and you name one type, this is usually the one you mean.
Low-pressure machines, which in practice means centrifugal chillers. A technician who has spent a career on rooftops may never have held this one, and a Type II card does not cover it.
All three. Worth asking for when the person will move between a chiller plant and packaged equipment in the same week, and worth not demanding when the role never goes near a low-pressure machine.
The practical failure this causes: a requisition that says only “EPA certified” invites a Type I card for a chiller seat, and a requisition that demands Universal removes competent Type II technicians from a role that will never see a low-pressure machine.
It never expires, and that changes the question you ask.
EPA states the certification credentials “do not expire”. There is no renewal, no continuing education and no lapsed status, so asking a candidate whether their 608 is current is asking about something that does not exist. Two questions are worth asking instead: which type or types do you hold, and can you produce the certificate.
The second one is less trivial than it sounds. EPA does not require a technician to carry the card while servicing appliances. What it requires is that they keep a copy at their place of business, and keep it until three years after they stop operating as a technician. A technician certified decades ago, by a proctor whose name they no longer remember, holds a valid certification that is genuinely hard to produce on demand - which is a reason to ask early rather than to condition an offer on it.
Is EPA 608 the same as NATE?
No, and this is the most common confusion on an HVAC requisition. One is a legal floor; the other is evidence of competence you may choose to require.
- Federal law, under the Clean Air Act and 40 CFR Part 82 Subpart F
- Required to service refrigerant-containing equipment at all
- Required to buy refrigerant at all
- Four types, not interchangeable
- Never expires, no continuing education
- Voluntary, run by North American Technician Excellence
- Evidence of competence, not permission to work
- Taken per specialty rather than as one qualification
- Renewed every two years, by 16 continuing-education hours or re-sitting the exam
- 120-day grace period after expiry
NATE also runs a Low-GWP Refrigerants certification. If you are hiring a crew that will work across the refrigerant transition, that is the specific thing to ask about - and it is a far more useful question than “NATE certified, yes or no”, which does not tell you which specialty the candidate holds.
Who is allowed to buy the refrigerant?
Only certified technicians, and this is a hiring constraint rather than a paperwork detail. Under EPA's refrigerant sales restriction, the certification is what permits the purchase of ozone-depleting refrigerants and of the non-ozone-depleting substitutes now used as refrigerants. An employer of a certified technician, or that employer's authorised representative, may buy on their behalf - but only by giving the wholesaler written evidence that the employer employs at least one properly certified technician.
Two consequences worth holding in mind when you plan a crew: an uncertified technician cannot be sent to collect refrigerant, and an operation with no certified technician on the books cannot buy it at all.
What actually kills an HVAC offer.
These are rendered from the same credential file our market pages read, so this page cannot drift away from them. Researched 2026-09-23.
EPA does not require a technician to carry the card while servicing appliances, so plenty of long-serving technicians do not have one to hand. What they must do is keep a copy at their place of business, and for three years after they stop working as a technician. An offer conditioned on producing it can sit for weeks while a duplicate is chased through whichever proctor certified them, sometimes twenty years ago.
Source →An apprentice may work on appliances before certification only while "closely and continuously supervised by a technician that has the appropriate section 608 certification(s) for the type of appliance that is being serviced". The cost of the cheaper hire is a share of a certified technician's day, and it is worth pricing that in before the requisition is written rather than after.
Source →The types map to equipment, not to seniority. A technician certified Type I is certified for small appliances and cannot legally service the low-pressure chiller the seat exists to cover; that needs Type III or Universal. The question to ask is which type, not whether.
Source →The credentials that gate this trade.
Required of any technician who maintains, services, repairs or disposes of equipment that could release refrigerant. The types are not interchangeable: Type I is "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 servicing or disposing of low-pressure appliances", and Universal for all of them. A Type I card does not cover a low-pressure chiller. The credential does not expire.
Source →Only EPA-certified technicians may buy ozone-depleting refrigerants or their non-ozone-depleting substitutes, which now covers the HFCs in most commercial equipment. An employer of certified technicians can buy on their behalf with written proof of employment. An uncertified technician cannot put refrigerant in a van.
Source →The trade's main voluntary competency certification, taken per specialty rather than as one qualification. It must be renewed every two years, either with 16 continuing-education hours or by re-sitting the specialty exam, with a 120-day grace period after expiry. NATE also runs a Low-GWP Refrigerants certification, which is the specific thing to ask about for a crew that will be working across the refrigerant transition.
Source →Frequently asked — EPA 608 and HVAC hiring.
Usually not: Type II is the legal minimum for most commercial HVAC work, so ask for the EPA 608 type that matches the equipment, which is how My Trade Talent recommends writing a commercial HVAC requisition. Type II covers high- and very high-pressure appliances, the bulk of commercial work: rooftop units, split systems, heat pumps and supermarket racks. A technician who will service low-pressure centrifugal chillers needs Type III or Universal, and Universal is worth asking for when the person moves between a chiller plant and packaged equipment in the same week. EPA's own wording for all four types is in the table on this page.
No. EPA states that Section 608 technician certification credentials "do not expire". A card issued in the 1990s is still valid today, which means "is your 608 current?" is not a useful question to put to a candidate - there is no such thing as lapsed. The useful questions are which type or types they hold, and whether they can produce the certificate. EPA does not require a technician to carry the card while servicing appliances, but it does require them to keep a copy at their place of business, and to keep it until three years after they stop operating as a technician.
EPA Section 608 is federal law and NATE is voluntary, and conflating them is the most common mistake on an HVAC requisition. Section 608, under the Clean Air Act and 40 CFR Part 82 Subpart F, is required of any technician who maintains, services, repairs or disposes of equipment that could release refrigerant - without it, a technician legally cannot do the work or buy the refrigerant. NATE, run by North American Technician Excellence, is an industry competency certification taken per specialty rather than as a single qualification, and it must be renewed every two years with 16 hours of continuing education or by re-sitting the specialty exam, with a 120-day grace period after expiry. So 608 is a floor you cannot hire below, and NATE is evidence of competence you may or may not require. Asking for "EPA and NATE certified" without knowing which specialty of NATE you mean will narrow your candidate pool for no gain.
No. Under EPA’s refrigerant sales restriction, only technicians holding the Section 608 certification may buy ozone-depleting refrigerants or the non-ozone-depleting substitutes now used as refrigerants, which takes in the refrigerants in most commercial equipment. An employer of a certified technician, or the employer’s authorised representative, may buy on their behalf, but only by giving the wholesaler written evidence that the employer employs at least one properly certified technician. The practical consequence for hiring is that an uncertified technician cannot be sent out to pick up refrigerant, and a one-person operation with no certified technician cannot buy it at all.
Yes, but only under supervision, and the supervision requirement is more specific than most employers realise. EPA states that apprentices can work on appliances prior to certification if they are closely and continuously supervised by a technician who holds the appropriate Section 608 certification for the type of appliance being serviced. "Appropriate" is doing real work in that sentence: a Type II technician cannot supervise apprentice work on a low-pressure chiller. The cost of the cheaper hire is therefore a share of a certified technician’s day, and it is worth pricing that in before deciding an apprentice is the economical option.
Ask for the type that matches the equipment, not the highest one available. Type II covers high- and very high-pressure appliances and is what most commercial service work needs. Type III covers low-pressure appliances, which in practice means centrifugal chillers. Universal covers all types. Demanding Universal for a role that will never touch a low-pressure machine removes qualified Type II technicians from your pool for no operational reason; conversely, writing "EPA certified" with no type at all tells a recruiter nothing, and is how a Type I card ends up in front of you for a chiller seat.
There is no single national lookup. EPA accredits a number of independent certifying programs, and each proctor holds its own records, so verification means identifying who certified the candidate and going to that body. This is why the certificate copy matters: a technician certified twenty years ago by a proctor they can no longer name is genuinely difficult to verify, even though the certification itself remains valid. Make the request early rather than conditioning an offer on it, because chasing a duplicate can take weeks.
Hiring commercial HVAC now? Our HVAC and mechanical page carries the trade detail and what our searches actually take, and our guide to commercial HVAC recruiting firms sets out how we work and what to ask any HVAC recruiter.
Where this came from.
EPA's own pages, read on 27 October 2026: Section 608 technician certification requirements, the refrigerant sales restriction, and the refrigerant management programme questions and answers. NATE's recertification terms come from North American Technician Excellence. The four type definitions are quoted verbatim from the first of those. Certification and licensing requirements change; the linked sources are the authority, not this page. This page does not cover state HVAC licensing, which is a separate body of law from Section 608. Last reviewed 27 October 2026.
