CSLB HVAC (C-20) Trade

Practice questions
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Full timed mock exam
A 100-question, 210-minute simulation to test your readiness.

Free practice for the CSLB HVAC (C-20) Trade exam. Original questions covering the official content areas — with a full timed mock exam.

The CSLB HVAC (C-20) Trade exam is about 100 questions, 210 minutes, 72% to pass. Practice by topic here, then take the full timed mock exam to gauge your readiness. Free, no signup.

What the CSLB HVAC (C-20) Trade exam covers

27%
Installation
20%
Load & Design
20%
Refrigeration
17%
Service & Troubleshooting
16%
Safety & Codes
Study guide →Browse all questions →

Helpful resources

Register — CSLB (official) →
Recommended prep — books & tools
  • Refrigeration and Air Conditioning Technology

    The standard HVAC textbook behind the C-20 trade and EPA 608 material.

    See it on Amazon →

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Frequently asked questions

Is PrepPass's CSLB HVAC (C-20) Trade practice free?

Yes — every CSLB HVAC (C-20) Trade practice question, study guide, and lesson on PrepPass is free. A full timed mock exam is also included at no cost.

How many CSLB HVAC (C-20) Trade practice questions does PrepPass have?

PrepPass currently has 400 original CSLB HVAC (C-20) Trade practice questions across 5 topic areas, and every question comes with a written answer explanation.

What languages is PrepPass's CSLB HVAC (C-20) Trade prep available in?

English, 中文 (Chinese), Español (Spanish), and Tiếng Việt (Vietnamese).

How are PrepPass's CSLB HVAC (C-20) Trade questions written?

They are original questions written by PrepPass from public-domain statutes and official exam blueprints — never copied from the real exam. Read our question methodology →

Is PrepPass affiliated with the licensing board or exam provider?

No. PrepPass is an independent study resource and is not affiliated with, endorsed by, or connected to any licensing board or official exam provider.

Can I practice CSLB HVAC (C-20) Trade on my phone?

Yes — PrepPass runs in any mobile or desktop web browser, with no app to download.

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