Is the EPA 608 Test Open Book? Proctoring and PT Chart Rules

Is the EPA 608 test open book?

Mostly no. Under federal rules, Type II, Type III and Universal must be closed-book, proctored tests given in a secure environment. The only open-book EPA 608 test is a Type I-only certification in the mail-in format, which some providers now also run online. That open-book route needs 84% to pass instead of 70%, and it can never count toward Universal. If you plan to work on residential or commercial AC, take every section, Core included, closed book and proctored from the start.

Where the "Core and Type 1 are open book" idea comes from

You've probably heard it on a forum or from a classmate. "Core and Type 1 are open book, but 2 and 3 aren't." It's half true, and the half that's wrong is the one that costs people money.

Every EPA 608 certification is built from 25-question sections. Core is always one of them. So a Type I certification is Core plus Type I, 50 questions in total. The federal standard lets organizations that offer Type I certification only choose an on-site format or a mail-in format. That mail-in Core plus Type I pair is the open-book test people are talking about.

The catch is the word "only." The same rule says the test for Type I taken as part of a Universal certification, Type II, Type III and Universal is a closed-book exam. Proctors must make sure you use no notes or training materials. You can read the exact wording in Appendix D, the federal standards for EPA 608 certifying programs. These rules have been in force since the November 18, 2016 update and still apply in 2026.

So there are two routes through Type I.

Notice the open-book version is harder to pass on the numbers. You need 21 correct answers per section instead of 18. And it's not a free-for-all. Mail-in Type I tests still need a way to verify who is taking them, and the study material sent with them can't include sample questions copying the test's language.

Who the open-book route actually suits

Type I covers small appliances, defined as 5 lb of refrigerant or less. If that's all you will ever work on, an open-book Type I is a legitimate, permanent credential. If you're heading for residential or commercial AC, which is Type II work, you have to test proctored anyway. For most HVAC students and career changers, the open-book route just means paying twice.

My open book Core doesn't count toward Universal. Do I have to retake it?

Yes. EPA's own certification page, updated July 15, 2026, says it plainly. "Core tests taken as an open book exam cannot be used to get your Universal Certification. The core test must be taken as a proctored exam in order to attain Universal Certification."

This trips up a lot of Mainstream Engineering candidates because Mainstream sells "Type I open book online (Core, Type I)" right next to its Universal exams. Its page does warn that if you want certifications beyond Type I, you must take the test in a proctored environment. But it's easy to miss.

Here is how the Core trap plays out. One candidate on r/HVAC described it step by step. First, they finished open-book Core and Type I. Then they passed Type II. After that, they were told they were not certified for Core or Type II, because Core was open book. The fix, they said, would cost another $110. Mainstream's own pages don't list that price, so ask them directly.

Here is how to fix an open-book Core, depending on your goal.

• You want Type II or Type III. Retake Core closed book and proctored. Only then do your Type II and Type III passes count.
• You want Universal. Retake Core closed book and proctored, and also retake Type I proctored for Universal, because mail-in Type I tests cannot be used toward a Universal certification.
• You only need small appliances. Do nothing. Your Type I-only certification stands, and EPA 608 credentials don't expire.

If you already passed a proctored Type II with Mainstream, ask them whether that pass stays on your record once you redo Core. Retake policies differ by provider, so get the answer in writing before you pay. At ESCO, passed sections stay passed and you retake only failed ones. If you would rather start clean somewhere else, ESCO's 2026 online exam is $85 and covers one attempt each at Core, Type I, Type II and Type III.

Is the EPA 608 exam proctored when you take it online?

Yes, for anything beyond Type I-only. An online Type II, Type III or Universal exam is still a closed-book, proctored test. The federal rule doesn't mention webcams. It only requires a proctored test in a secure environment. EPA-approved programs meet that with remote proctoring, and that is how most online candidates test today.

How the main providers handle it in 2026.

• ESCO Institute runs its online exam through ProctorU, 24 hours a day. It offers both the 2026 exam and the 2018 exam, gives results the same day and mails the card the next business day. It has no open-book option.
• Mainstream Engineering offers Universal online, Universal in person, and the open-book Type I online. Its online Universal allows a maximum of three hours for 100 questions. It gives a printable temporary card right away and mails the physical card within 2 business days.
• SkillCat bundles training, study guides and the exam in an app for $10. It uses a virtual proctor that watches you through your device webcam. It says Type I-only is the one open-book exam.

Can I take the EPA 608 online from home with a webcam?

Yes. Here is what you need for a webcam exam. You need a computer with a webcam and microphone, a reliable connection, a government photo ID and a quiet private room. ESCO uses the ProctorU Guardian Browser or Chrome extension. Tablets, iPads and Chromebooks are not supported. Mainstream adds room rules. The room must be well lit with no one else present, you need a clear hard work surface, second monitors must be unplugged, and non-religious head coverings come off.

Expect it to be strict. SkillCat candidates describe a front-facing camera that stays on for the whole test, with automatic failure if you're caught looking at another device. One put it simply. "You have to have the camera on and can't look away." Others found it painless and passed everything in a weekend. Either way, keep your eyes on your own screen.

Book at least 72 hours ahead with ESCO or Mainstream to avoid rush fees.

Are you allowed a PT chart or calculator on the EPA 608 exam?

It depends on your provider. The federal rule says nothing about charts or calculators specifically. It only says proctors must keep notes and training materials out of the room. Each program sets its own policy, and they don't agree.

• ESCO. ESCO's Section 608 preparatory manual says the only outside materials allowed are a temperature/pressure chart and a calculator. ESCO publishes a 2026 PT chart as the reference chart used with the 2026 exam, and a separate 2018 chart for the 2018 exam.
• Mainstream. Its Universal exam page says "No calculator is allowed during test taking." A candidate on r/HVAC reported that Mainstream gives you the PT chart to use.
• SkillCat. Ask before test day. Its page doesn't spell out chart or calculator rules.

In person, it varies by proctor. Candidates report laminated charts and scratch paper handed out at some sites, while others were told to bring their own chart. One candidate brought and used a printed chart in an online-proctored exam. If your provider allows a chart, print the right edition and show it to the proctor at check-in. Remember that in-person proctors collect all test forms, answer sheets, scratch paper and notes at the end.

A chart only helps if you can read it. Match the temperature to the pressure for the right refrigerant, and know to add 14.7 to convert psig to psia. That conversion appears in EPA's own test topics.

Match your chart and manual to your exam edition

ESCO released an updated Section 608 test bank in August 2026. Its 2018 exam remains available until January 1, 2027. For the 2026 exam, use the 10th Edition manual and 2026 PT chart. For the 2018 exam, use the 9th Edition manual and 2018 PT chart. Mixing them up is an avoidable way to lose points.

Before you book your EPA 608 exam

Run through this before you pay.

1. Decide your goal first. If you'll touch anything bigger than a small appliance, skip the open-book Type I.
2. Pick a provider whose aid rules you're comfortable with, especially on calculators.
3. Check your hardware. No tablets or Chromebooks for ESCO's remote exam.
4. Have your government photo ID ready. ESCO may also ask for your Social Security number and home address.
5. Find a private, well-lit room and clear your desk.
6. Install the Guardian Browser and book 72 hours or more ahead.
7. Print the PT chart for your exam edition if your provider allows one.

Closed book means you need the dates, recovery levels and refrigerant classes in your head. Our guide on how to study for the EPA 608 exam and pass Universal first try covers realistic study hours and a one-week plan. If you'd like a daily schedule built around your test date, MindMax is an adaptive tutor app from Ed Cooke and Daniel Zohar, who built Memrise. It maps a plan of short, conversational lessons to get you to a pass, whether you have months or days left.