EPA Section 608 · 40 CFR Part 82, Subpart F

Practice tests for the Section 608 exam, with the regulation attached.

Every question shows the paragraph of 40 CFR it was written from, quoted word for word, with the date it was checked against the eCFR. One payment. Not a subscription.

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$24.99 Core plus one type · $39.99 all four types · one-time

The card is not optional

40 CFR § 82.154(c)(1)

A supplier cannot lawfully sell you refrigerant until you hold the certification. That is not a market convention or a distributor policy. It is the sales restriction, and it is written into the Code of Federal Regulations.

The paragraph lists further conditions after the two quoted here — they cover MVAC certification under subpart B, sales for eventual resale, sales to appliance manufacturers, and refrigerant already charged into equipment. None of them help a technician who is not certified.

Certification attaches to the work, not to a job title. Under § 82.161(a)(1) it applies to anyone who could reasonably be expected to violate the integrity of the refrigerant circuit.

No person may sell or distribute, or offer for sale or distribution, any substance that consists in whole or in part of a class I or class II substance or, starting on January 1, 2018, any non-exempt substitute for use as a refrigerant unless: The buyer has been certified as a Type I, Type II, Type III, or Universal technician under § 82.161; The buyer employs at least one technician who is certified as a Type I, Type II, Type III, or Universal technician under § 82.161 and provides proof of such to the seller; …

40 CFR § 82.154(c)(1)eCFR snapshot August 13, 2026

What a question looks like

Shown answered

Most prep material gives you a question, an answer, and a sentence of reassurance. When two sources disagree — and on Section 608 they frequently do — you have no way to settle it, because neither of them will tell you where the answer came from.

Superheat attaches the source to the answer. Class, citation, the paragraph quoted verbatim, the eCFR issue date it was checked against, and a link to the paragraph on ecfr.gov so you can read the rest of it. If we are wrong, the card gives you everything you need to prove it.

How the questions are made and checked

ExampleREGCORE-F0049

A definition in this subpart begins “to evacuate refrigerant from an appliance, or the affected”. Reading the quoted paragraph, which term does it define?

Refrigerant
Mothball — correct answer
Full charge
Component

The quoted paragraph is the definition itself, and the term it defines is “Mothball”. Definitions in this subpart are load-bearing rather than incidental: several requirements apply only to appliances or persons that meet a defined description, so reading the definition is often what settles whether a rule applies at all. The other options are terms the same subpart defines elsewhere.

Mothball means to evacuate refrigerant from an appliance, or the affected isolated section or component of an appliance, to at least atmospheric pressure, and to temporarily shut down that appliance.

40 CFR § 82.152 "Mothball"eCFR snapshot 2026-08-13

On the sample page the citation and the quoted paragraph appear only after you answer, exactly as they do in the app. For a question asking what pressure a paragraph requires, printing the paragraph first would not leave a question.

What is in the app

A diagnostic before anything else

Twenty questions across the subject areas, then a readiness figure per section. You see it before you are asked to pay for anything.

Drills that follow the misses

Short sessions weighted toward your weakest subject area, with a 1/3/7/21-day review ladder so a topic you got wrong comes back before the exam, not after it.

A full-length mock exam

Built to the structure the regulation prescribes: at least 25 core questions and at least 25 from each relevant technical group, scored per section against the 70 percent standard.

The regulation, on the device

Subpart F is bundled in the app and browsable. Tapping a citation opens the section it came from. No network required for any of it.

Works with no signal

Diagnostic, drills, mock exam, scoring, citations and the regulation browser all work from a cold start with the radio off. Plant rooms and basements are where this gets used.

No account

No sign-up, no email address, no password. Your answer history stays on the device and is never uploaded. What that means precisely.

Which type you need

40 CFR § 82.161(a)(1)

Descriptions below are the regulation’s own wording, not a summary of it. Core is included with every purchase because every test includes it.
Type	Covers	The paragraph
Type I	Small appliances.	Persons who maintain, service, or repair small appliances must be certified as Type I technicians.
Type II	Medium-, high- and very high-pressure appliances.	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.
Type III	Low-pressure appliances.	Persons who maintain, service, repair, or dispose of low-pressure appliances must be certified as Type III technicians.
Universal	All of the above.	Persons who maintain, service, repair, or dispose of all appliances described in paragraph (a)(1)(i) through (iii) of this section must be certified as Universal technicians.

What it costs

One-time

Core plus one type

$24.99once

Everything in the app for Core and the one technical type you are sitting. Upgrade later for $19.99 and you never pay for Core twice.

All four types

$39.99once

Core, Type I, Type II and Type III. This is what you want if you are sitting Universal.

It is not a subscription. There is no renewal, no auto-charge and nothing to cancel. Subpart F sets no expiry date and no renewal requirement for technician certification, so a recurring charge for exam practice would be indefensible. Subpart F does provide, at § 82.161(a)(3), for a certificate to be revoked or suspended.

Training programs buy differently: $8 per seat, 20 seat minimum, invoiced. What an instructor gets.

The 70 percent

Appendix D(e)

The passing score for the closed-book Type I, Type II, Type III and Universal certification test is 70 percent. The passing score for Type I certification tests using the mail-in format is 84 percent.

40 CFR Part 82, Subpart F, Appendix D(e)eCFR snapshot August 13, 2026

That figure is real and it is where the app’s readiness marker sits. It is also the certifying program’s figure, not ours. Superheat does not administer the certification test, does not score it, and cannot certify anyone. A readiness number in this app is an estimate from practice answers and nothing more.

Who makes this and what it is not

What this is not

Not a certification. Passing every question here certifies you for nothing.
Not the real test. The question bank the certifying programs draw from is released by the Administrator only to approved programs; nobody outside them has it, and anyone who tells you otherwise is describing something they should not have.
Not copied from anybody’s bank. Questions are written from the text of 40 CFR, which is a work of the United States Government and not subject to copyright.
Not affiliated with the EPA, and not endorsed or approved by it.
Not a promise that you will pass. We have no pass-rate figure to quote, so we do not quote one.

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