EPA 608 Type I is the federal certification for technicians who maintain, service, or repair small appliances — equipment fully manufactured, charged, and hermetically sealed in a factory with five pounds or less of refrigerant, among them refrigerators, window and portable air conditioners, dehumidifiers, vending machines, and water coolers.
And yes — Type I is the one credential EPA's rules let certifying organizations offer open book, on-site or by mail-in, with a higher 84 percent pass mark.
What equipment does Type I cover?
Type I is defined by the equipment, not the job title.
EPA's rule defines a small appliance as one fully manufactured, charged, and hermetically sealed in a factory with five pounds or less of refrigerant — and both conditions have to hold.
An appliance that is charged on site, or that holds more than five pounds, is not a small appliance under the rule, whatever it looks like.
The definition's own examples give you the practical list:
- Household refrigerators
- Window and portable air conditioners
- PTACs and PTHPs — packaged terminal air conditioners and heat pumps
- Dehumidifiers
- Vending machines
- Water coolers
Appliances outside that definition are not Type I work — which credential covers them instead is a match-the-equipment question our guide to EPA 608 types answers.
Who needs Type I certification?
The trigger is the work, not the employer.
Under EPA's Section 608, persons who maintain, service, or repair small appliances must be certified as Type I technicians — one of the four credentials under EPA 608 certification.
If your job includes servicing household refrigerators, window units, vending machines, or PTACs, or repairing dehumidifiers and water coolers, Type I is the credential that work requires.
Vending machines sit on the small-appliance definition's own example list, so vending and refreshment-service technicians need Type I exactly the way appliance-repair technicians do.
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How does the open-book online Type I test work?
One exam, two routes.
Every EPA 608 exam — Type I included — must carry at least 25 questions from the core group and at least 25 from the Type I technical group.
What changes by route is the supervision and the pass mark.
The open-book routes.
Organizations that offer only Type I certification may administer the exam on-site or as a mail-in — the formats behind the "open book" listings.
The mail-in format passes at 84 percent, against 70 percent for the closed-book tests, and a mail-in Type I pass cannot be used toward Universal certification.
Ask the organization you choose how its mail-in exam runs and what it lets you reference; our research did not confirm individual organizations' mail-in logistics, so treat the organization's own instructions as the authority for their process.
The proctored route.
Type I taken as part of Universal is a closed-book, proctored test given in a secure environment by an EPA-approved certifying program, and the closed-book Type I test passes at 70 percent.
That is the version that stacks toward Universal later.
Online.
Remote testing is a channel EPA's own list confirms: the approved-program list, updated August 20, 2026, marks programs offering remote testing — ESCO Institute and Mainstream Engineering among them — and three that test online only: Faraday EPA Certification, SkillCat, and Solar One.
SkillCat itself is an EPA-approved certifying program, so an online-only offer can be legitimate; the check is EPA's list, not the ad.
What the list does not settle is which organizations deliver the open-book Type I test online — our research did not confirm that — so ask the organization you choose how it runs Type I before you book.
After you pass, the rule's clock applies: certifying programs must report your results and issue the standard wallet-sized card within 30 days of the test — a legal ceiling, not a promised turnaround.
Which route should you pick?
If Universal is even a possibility, take the proctored Type I from the start, because the mail-in pass never converts.
If you will only ever work on small appliances, the open-book route fits exactly that scope.
The organization-by-organization comparison — webcam setups, red flags, which programs test which sections — is its own topic; see our guide to taking the EPA 608 test online.
Check EPA's list before you pay
What topics are tested?
A Type I candidate's exam has two parts: the shared Core section and the Type I technical group, each carrying at least 25 questions.
EPA publishes the Core topics: ozone depletion; the Clean Air Act and the Montreal Protocol; the venting prohibition; the refrigerant sales restriction; the "three Rs" — recover, recycle, reclaim; recovery and evacuation techniques; safety, including never filling a cylinder more than 80 percent full and using nitrogen, not oxygen, for leak testing; and shipping labels.
Our EPA 608 Core guide goes section by section.
EPA also publishes topic lists for the Type II and Type III sections; the sources we checked include no published topic list for Type I.
Prepare from the small-appliance rules themselves instead.
The numbers a small-appliance technician lives by are the recovery requirements: recover 90 percent of the refrigerant with the compressor working, 80 percent with it not working, using recovery equipment made after November 15, 1993 — or evacuate the appliance to 4 inches of mercury vacuum.
For a plan built around those topics, our section-by-section EPA 608 study guide covers what to memorize.
Type I practice questions
Try these.
They are practice questions we wrote from EPA's rule text for this guide — not real exam items and not "test answers."
And note the label on any course or guide marketed as "EPA-approved": EPA approves certifying programs, not preparatory materials, so the designation does not exist for study products.
1. Which of these is on EPA's small-appliance example list?
- A vending machine
- A residential split system
- A low-pressure chiller
- A rooftop packaged unit
Answer: the vending machine.
It is one of the small-appliance definition's own examples — appliances fully manufactured, charged, and hermetically sealed in a factory with five pounds or less of refrigerant.
The others are not on that list; anything not named has to meet the factory-sealed, five-pound test in the definition on its own terms.
2. A window air conditioner is fully manufactured, charged, and hermetically sealed at the factory, holding under five pounds of refrigerant. What certification must you hold to service it?
- Type I
- Type II
- Type III
- None — small appliances are exempt
Answer: Type I.
Persons who maintain, service, or repair small appliances must be certified as Type I technicians, and a factory-sealed window unit inside the five-pound limit is squarely within the definition.
3. What passing score does the mail-in Type I format require?
- 70 percent
- 75 percent
- 84 percent
- 90 percent
Answer: 84 percent.
The closed-book Type I, Type II, Type III, and Universal tests pass at 70 percent; the mail-in Type I format passes at 84 — and cannot be used toward Universal.
4. The compressor in a small appliance still runs. With recovery equipment made after November 15, 1993, how much refrigerant must you recover?
- 80 percent
- 90 percent
- 100 percent
- None of the above
Answer: 90 percent.
With the compressor functioning you recover 90 percent; the 80 percent figure applies when it is not working.
The rule also allows evacuating the appliance to 4 inches of mercury vacuum as the alternative standard.
5. True or false: a mail-in Type I pass can later be combined with Type II and Type III passes to earn Universal certification.
Answer: false.
Mail-in format Type I tests cannot be used toward Universal certification.
If Universal is a possibility, sit the closed-book, proctored Type I from the start.
Want the full run-through?
Our free EPA 608 practice test covers Core, Type I, Type II, and Type III with explanations for every answer.
This page is career information, not legal advice. Confirm current requirements with EPA's Section 608 program and your chosen certifying organization.