C-20 HVAC Contractor Exam

Passing The C-20 HVAC Trade Exam is Easy as 1,2,3!

  1. Commit to passing your C-20 Warm-Air Heating, Ventilating & Air Conditioning Contractor exam. Prepare at HOME on your schedule; “Read, Listen, Watch, Learn, &  PASS!”
  2. Apply to the CSLB. We will also help you with your application! Call us for assistance.
  3. Study. Our clients typically pass on their 1st attempt! “Follow the plan & pass your exam!”

All qualifying individuals must also pass their California Law & Business Exam (sold separately)



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C-20 HVAC Warm-Air Heating, Ventilating & Air-Conditioning Contractor (Trade Exam)

Pass the C-20 HVAC exam on your 1st attempt. Unleash the most effective and affordable C-20 contractors’ license course available in California. Our clients pass their C-20 HVAC Contractor trade exam.

Pass your C-20 Warm Air Heating, Ventilating, and Air Conditioning exam; it’s simple as 123!

ONE – Commit to passing your C-20 HVAC Contractor license exam, prepare at HOME & on your schedule. Read, Listen, Watch, Learn, & PASS!

  • Read our best in the industry C-20 exam preparation manual.
  • Listen & watch as experts review Math & Title 8 Health & Safety Rules.
  • Learn the art of dominating a four-question multiple-choice exam.
  • PASS your California C-20 Remodeling Contractor exam.

The most effective contractors’ license course available in California at ANY price!

Study Online! Our multimedia C-20 HVAC contractor course is your best & most affordable method to pass your Contractor License Exam!

TWO: Apply to the CSLB. We will help! New online tools help fill out your application. Call us for assistance, and schedule a free line-by-line review of your application before submission to the CSLB!

With our help, submitting a proper C-20 HVAC Contractor License application to the CSLB has never been easier!

THREE: Prepare for and pass your exam. Our students dramatically improve their test scores and pass their contractors’ license exams.

When ready to test, schedule your exam through PSI. Please read the PSI Candidate Information Bulletin for more information. PSI – C-20 Warm Air Heating Ventilating and Air Conditioning

IT’s A FACT! when you read something – eTEXTBOOKS, watch something – VIDEO FILES, hear something – AUDIO FILES, and then put that information to use – ONLINE PRACTICE QUESTIONS  & ONLINE EXAMS, your ability to retain our study materials increases exponentially!

COURSE DETAILS: C-20 HVAC Contractor (Trade Exam)

Study at home! Don’t waste time commuting to a classroom; study conveniently in your home or office. Our courses are a proven, reliable, and affordable way to pass the C-20 HVAC contractors exam.


Choose your course format from either

eCourse – 100% Online! Trade eManual (not printable)Streaming Audio/Video, & Online Practice Tests

Or Printed Manual + Online Audio/Video & Online Practice Tests

Or Printed Manual + CD’s, DVD’s & Online Testing

Our C-20 HVAC License, Trade Exam Course includes the following materials to maximize your study efforts.

  • Trade Specific Textbooks
  • Audio Lectures
  • Video Lectures
  • Online Practice Questions
  • Simulated Online Exams
  • Business Building Tools


The C-20 HVAC contractor exam manual briefly covers important State exam of topics, including Properties of Air & Water, Psychrometric Charts, Basic HVAC Formulas, Basic Electrical Formulas, Electrical & Insulating Materials, Soldering & Brazing, Electric Motors, Fuels & Refrigerants, Mechanical Refrigeration, Solar Energy, Plan &  Circuit Symbols, summaries of the California Mechanical Code, and Cal/OSHA Health & Safety Orders.

The C-20 HVAC Contractor Study Guide contains the following sections;

  • GENERAL KNOWLEDGE: This contains basic trade information all students must know to pass the C-20 Trade exam.
  • MATH REVIEW: The Math Review Lecture covers math and estimating formulas, measurement units, basic geometry, and the architect’s scale.
  • HEALTH AND SAFETY: Our comprehensive health and safety section familiarizes students with Cal/OSHA and other regulations and practices.
  • REVIEW QUESTIONS: Lists the most difficult questions, indexed to the relevant section of the manual.


  • Expert instructors with decades of related trade experience cover key C-20 HVAC contractor exam concepts in greater detail. Our A/V lectures include math formulas, C-20 General Knowledge & Review Question lecture, and Title 8 Health & Safety Orders.


  • VIRTUAL FLASHCARDS: online flashcards. Our program tracks your history and also allows you to exclude questions you have already learned.
  • PRACTICE EXAMS: Four final practice exams, each timed to simulate actual exam conditions. The course also includes two Cal/OSHA Health & Safety tests. (exams are approximately 120 questions each.) Our Health and Safety update lists any new questions to reflect changing trends in exam focus.


  • Get help filling out your contractor exam application or request a free review of your completed form before submission. All students in our C-20 HVAC course can call us at (866) 685 8564 for assistance.

ONE YEAR UNLIMITED ACCESS: To All Online eBooks, Audio/Video, Test Questions & Simulated Final Exams.

We provide complete access to all online course materials for an entire year. Other schools may offer only 90-day access to online tools in the hopes of charging you extra $ for extended access to study materials.


C-20 HVAC Contractor exam course with C-20 Trade CD's DVDs & online practice tests



A detailed breakdown of the makeup of the C-20 HVAC Contractor trade exam. A list of all reference materials used to create the Exam & the scope of the C-20 HVAC contractor classification.


Section 1. Planning and Estimation – 25% of C-20 Exam

  • HVAC system design and evaluation
  • Load and psychrometric calculations
  • Duct system design and layout
  • Job cost estimation

Section 2. Fabrication, Installation, and Startup – 29% of C-20 Exam

  • Duct system fabrication
  • Equipment installation
  • Electrical and mechanical components
  • Plumbing and refrigeration components
  • Air distribution and duct systems
  • HVAC system startup

Section 3. Troubleshooting, Repair, and Maintenance – 24% of C-20 Exam

  • HVAC system diagnostic tests and evaluation
  • HVAC system maintenance or repair

Section 4. Safety – 22% of C-20 Exam

  • Personal protective equipment (PPE)
  • Job site safety requirements (Cal/OSHA)
  • Handling hazardous materials
Percentages are approximate

C-20 HVAC Warm Air Heating Ventilation & Air Conditioning exam source material:

The CSLB utilizes the following publications to create the Warm Air Heating, Ventilating, and Air-Conditioning (HVAC) exam. California codebooks are available online: www.bsc.ca.gov

2019 Building Energy Efficiency Standards for Residential and Nonresidential Buildings. California Energy Commission.
PHONE: (800) 772-3300

2019 California Building Code. Title 24. International Code Council.
PHONE: (800) 786-4452.
INTERNET: http://www.iccsafe.org

2019 California Electrical Code. California Code of Regulations, Title 24. BNI Publications, Inc.
PHONE: (888) 264-2665
INTERNET: www.bnibooks.com

2019 California Energy Code. California Code of Regulations, Title 24. International Code Council.
PHONE: (800) 786-4452
INTERNET: www.iccsafe.org

2019 California Mechanical Code. Title 24. International Association of Plumbing and Mechanical Officials (IAPMO).
PHONE: (800) 854-2766.
INTERNET: http://www.iapmo.org

2019 California Plumbing Code. Title 24. International Association of Plumbing and Mechanical Officials (IAPMO).
PHONE: (800) 854-2766.
INTERNET: http://www.iapmo.org

ASHRAE Handbooks (Fundamentals; HVAC Systems and Equipment; HVAC Applications; and Pocket Guide). ASHRAE.
PHONE: (800) 527-4723
INTERNET: www.ashrae.org

HVAC Duct Construction Standards – Metal and Flexible. Sheet Metal and Air Conditioning Contractors’ National Association.
PHONE: (800) 886-2653
INTERNET: www.smacna.org

– Manual CS – Commercial Applications, Systems, and Equipment.
– Manual D – Residential Duct Systems.
– Manual H – Heat Pump Systems.
– Manual J – Residential Load Calculation.
– Manual N – Commercial Load Calculation.
– Manual P – Psychrometrics.
– Manual Q – Commercial Duct Design.
– Manual RS – Comfort, Air Quality, and Efficiency by Design.
– Manual S – Residential Equipment Selection.
Air Conditioning Contractors of America.
PHONE: (888) 290-2220
INTERNET: www.acca.org/home

Modern Refrigeration & Air Conditioning Technology; Johnson, B.,  Silberstein, E., Tomczyk, J., Whitman, B. Cengage Learning.
PHONE: (800) 354-9706
INTERNET: www.cengage.com

State of California General Industry & Electrical Safety Orders (Cal/OSHA) and State of California Construction & Electrical Safety Orders (Cal/OSHA). 2022. California Code of Regulations, Title 8. Mancomm.
PHONE: (877) 626-2666
INTERNET: www.mancomm.com

Publisher information is current as of 5/22

Official CSLB Description of License Classification for the HVAC Contractor.

C-20 Warm Air Heating, Ventilating and Air-Conditioning (HVAC) Contractor fabricates, installs, maintains, services, and repairs warm air heating systems and water heating heat pumps, complete with warm air appliances; ventilating systems complete with blowers and plenum chambers; air-conditioning systems complete with the air-conditioning unit; and the ducts, registers, flues, humidity, and thermostatic controls and air filters in connection with any of these systems. (832.20 CCR)



We offer our study materials as two separate courses; Course One is the C-20 HVAC TRADE EXAM. Course Two is the California LAW & BUSINESS EXAM. (Each Course Sold Separately)


Law & Business Exam

Pass the CA LAW & BUSINESS EXAM covering California contractor law, and pass the TRADE EXAM covering the trade you wish to practice.

Pass both exams to qualify for your 1st contractor’s license. “Read, Listen, Watch, Learn, & PASS!”

More About the Law & Business Exam



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FREE C-20 HVAC Practice Exam (Trade Exam)

Take a free C-20 HVAC Contractor practice test. These free C-20 HVAC questions are similar to the ones you will encounter when taking the actual C-20 contractors exam.

You are off to a strong start if you readily answer seven or more questions correctly without guessing.
However, if you miss three or more questions, you risk failing the TRADE portion of the C-20 Exam.

Welcome to your Free C20 HVAC Exam

A chiller refrigerates which of the following?
Why should a drip leg be installed?
What is the function of a thermocouple in a gas furnace?
A packaged water source heat pump eliminates which of the following components?
Reclaimed refrigerants shall not be reused in a different owners equipment unless tested and found to meet the purity requirements __________.
What is the amount of heat energy required to evaporate 1 pound of water?
Pressure on the high pressure side of a mechanical refrigeration unit is called __________.
In an air conditioning and refrigeration system, what occurs in an evaporator?
An appliance rated at 75.000 BTHU imput must be placed in a room containing a minimum of __________cubic feet in order to be in an unconfined space.
A customer moves up from an 8 SEER air conditioner to a 13 SEER air conditioner. What would his yearly savings be if he was paying $650 per year for air conditioning. ​
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