Construction Guys C-20 HVAC exam book with black comb binding

Construction Guys · Let's Build This Right

California C-20
HVAC License Exam Book

Understand the system. Build your confidence.

Start with heat, air, pressure and the whole HVAC system. Build toward equipment selection, ducts, refrigeration, furnaces, heat pumps, controls, troubleshooting and the business side of the trade.

$79.95 USD · one-time purchase

One printed book + matching PDF included.
Free shipping.
Ships the next business day via FedEx.

Buy printed book + PDF — $79.95 Look inside the book

Read real sample pages before you buy. No sign-up needed.

300+ pagesin the printed book

36 chaptersfrom foundations to exam practice

500 questionsoriginal practice with explanations

See the teaching style for yourself

Open the book. Start learning.

Plain-language explanations, worked examples and diagrams help you understand the why behind the answer. These are actual pages from this HVAC book.

Actual C-20 HVAC book sample: Meet Clifton and see the whole HVAC system — Meet Clifton and see the whole HVAC system
Tap the page to enlarge

Actual C-20 HVAC book sample: Learn airflow math with a worked example — Learn airflow math with a worked example
Tap the page to enlarge

Actual C-20 HVAC book sample: Read air properties on an illustrated chart — Read air properties on an illustrated chart
Tap the page to enlarge

Read a free 18-page preview

Includes the full table of contents, Clifton’s introduction, worked math, air-property and controls illustrations, diagnostic examples, and original final-exam questions with explanations.

Open / download the free PDF preview

Selected pages retain their original book page numbers. Page references point to the full book; use the preview's PDF bookmarks to move between sections.

The full learning path

What's inside all 36 chapters

Start with the basics, connect the ideas to a job, then practice explaining your answers. Expand each group to see the complete table of contents.

Chapters 1–6 · Build your HVAC foundation

You can start here. Then build it right.
A study plan that makes knowledge stick.
Heat, air, and pressure. Meet the whole system.
The math is learnable. Keep the units attached.
Psychrometrics: what the air is carrying.
Size the job. Then select the equipment.

Chapters 7–18 · Plan and understand the systems

Plans, quantities, and a price that works.
Duct design: spend the pressure wisely.
Fabrication and air distribution: make the drawing work.
Set the equipment so it can be serviced safely.
Electrical fundamentals for the HVAC contractor.
Controls and motors: follow the sequence.
Refrigeration: follow the heat around the loop.
Piping, refrigerants, and responsible handling.
Furnaces, fuel, and safe combustion.
Heat pumps: one system, two directions.
Ventilation and indoor air: comfort has more than one number.
Startup and commissioning: prove the system works.

Chapters 19–29 · Diagnose, work safely and run the business

Airflow troubleshooting: find the restriction or the leak.
Refrigerant and electrical diagnosis: use patterns, then prove them.
Maintenance that protects performance and trust.
Safety belongs in every decision.
The license and the company are your responsibility
Money: revenue is not your paycheck
Build a crew you can stand behind
Contracts and changes: put the agreement on paper
Insurance, bonds, liens, and getting paid
Public works: different money, different rules
The Bayview project. Bring the pieces together.

Chapters 30–36 · Practice, review and keep growing

Two practice exams. Find your weak spots.
C-20 HVAC final practice exam
Law & Business final practice exam
The answers matter. The reasons matter more.
Your field of knowledge. Your study reference.
Go to the source. Keep your knowledge current.
Build your skills. Then build your company.

One book package. Clear value.

Built for study that sticks.

Learn and practice

Beginner foundations, illustrated explanations and worked examples.
HVAC trade topics plus Law & Business study material.
Chapter checks, practice exams and final practice exams.
Original questions with answers and explanations.
Study planning, licensing steps and reference resources.

Your $79.95 package

One comb-bound printed C-20 HVAC exam-preparation book with 300+ pages.
Free shipping for the printed book. Ships the next business day via FedEx.
The matching downloadable PDF edition included.
Access your included PDF through your Construction Guys student library after purchase.

Print and PDF layouts may paginate differently; they cover the same material. You do not need to buy a separate PDF.

Use this book to build understanding, find weak spots and prepare with a plan. It is independent exam-preparation material, not an official CSLB publication. Passing and license approval depend on your preparation and meeting CSLB requirements; no book can guarantee either.

From Clifton Leung

Learn the trade.
Build your future company.

Clifton started Construction Guys in 2015 with two friends and learned through real business challenges. That experience is the reason behind this school: make the path clearer for the next person starting out.

The teaching style is direct, practical and focused on understanding the work and the business behind it. Read Clifton's story in the free preview.

Want instructor support too?

Construction Guys plans to offer optional license-preparation courses. Course enrollment is separate from this book purchase; view current tuition on the license-preparation course page. Class dates and availability will be announced.

Explore license-preparation courses →