100+ Free CA C-20 HVAC Practice Questions

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2026 Statistics

Key Facts: CA C-20 HVAC Exam

$450

Application Fee (incl. exam)

CSLB

72%

Passing Score

CSLB

4 years

Experience Required

CSLB

$25,000

Contractor Bond

CSLB

2 Exams

Trade + Law/Business

CSLB

100 Q

Practice Questions Available

OpenExamPrep

About the CA C-20 HVAC Exam

The California C-20 HVAC contractor exam includes both a Trade exam and a Law & Business exam. The C-20 classification covers warm-air heating, ventilating, and air-conditioning work. Four years of journeyman-level experience and a $25,000 contractor bond are required.

Questions

115 scored questions

Time Limit

5 hours

Passing Score

72%

Exam Fee

$450 (application includes exam) + $200 (initial license) (California Contractors State License Board (CSLB))

CA C-20 HVAC Exam Content Outline

25%

California Law & Business

CSLB licensing regulations, contractor bond, mechanics' lien law, insurance, contracts, and business management

25%

HVAC Trade Knowledge

Heating and cooling systems, refrigerant handling, load calculations, equipment selection, and system design

20%

California Codes & Standards

Title 24 energy code, California Mechanical Code, HERS testing, and permit requirements

15%

Ductwork & Installation

Duct design, insulation, sealing, airflow balancing, and commissioning procedures

15%

Safety & EPA Regulations

Cal/OSHA requirements, EPA Section 608, hazardous materials, and fire safety

How to Pass the CA C-20 HVAC Exam

What You Need to Know

Passing score: 72%
Exam length: 115 questions
Time limit: 5 hours
Exam fee: $450 (application includes exam) + $200 (initial license)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

CA C-20 HVAC Study Tips from Top Performers

1Study the CSLB Law & Business exam thoroughly — it covers California-specific contract law, mechanics' lien law (20-day preliminary notice), and licensing regulations

2Master California Title 24 energy code requirements including HERS verification, duct testing, and minimum efficiency standards

3Focus on the $25,000 contractor bond requirement, workers' comp insurance mandate, and CSLB complaint/disciplinary process

4Understand California's climate zones and how they affect HVAC design, especially the diverse conditions from coastal to inland desert

5Review Cal/OSHA standards which are often stricter than federal OSHA, particularly for heat illness prevention and fall protection

Frequently Asked Questions

What is the California C-20 HVAC license?

The C-20 classification is issued by the CSLB for warm-air heating, ventilating, and air-conditioning contractors. It requires passing both a Trade exam and a Law & Business exam with a minimum score of 72% on each.

How much experience do I need for the California C-20 license?

You need 4 years of journeyman-level experience within the past 10 years. Up to 3 years of education from an approved program can substitute for experience. You must be at least 18 years old.

What bond is required for California C-20 contractors?

California requires a $25,000 contractor's bond for all licensed contractors. Workers' compensation insurance is also mandatory even if you have no employees.

How much does the California C-20 license cost?

The application fee is $450 (includes exam), the initial license fee is $200 (individual) or $350 (LLC/corporation), and fingerprinting costs approximately $75. Plus the $25,000 bond premium.

Does California require continuing education for C-20 license renewal?

As of 2025, the CSLB does not require continuing education for license renewal. However, contractors must stay current with code changes and renew their license every two years.