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ArticleFree HVAC Contractor Practice Test by State 2026: 3,400+ Questions24 min read
Exam Review

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

Sample CA C-20 HVAC Practice Questions

Try these sample questions to review concepts for the CA C-20 HVAC exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 122+ question experience with AI tutoring.

1Which California state agency administers the C-20 HVAC contractor license?
A.California Department of Consumer Affairs
B.California Contractors State License Board (CSLB)
C.California Energy Commission
D.California Air Resources Board
Explanation: The California Contractors State License Board (CSLB) administers all contractor licensing in California, including the C-20 Warm-Air Heating, Ventilating and Air-Conditioning classification. The CSLB oversees licensing exams, renewals, complaints, and disciplinary actions.
2What two exams must be passed to obtain a California C-20 HVAC contractor license?
A.Only a trade exam
B.A Trade exam and a Law & Business exam, each requiring 72% to pass
C.A written exam and a practical exam
D.Only a law exam
Explanation: California C-20 applicants must pass both a Trade exam (covering HVAC-specific knowledge) and a Law & Business exam (covering California contractor law, business management, and licensing regulations). A minimum score of 72% is required on each exam.
3What is the minimum passing score for both California C-20 licensing exams?
A.65%
B.70%
C.72%
D.75%
Explanation: Both the California C-20 Trade exam and the Law & Business exam require a minimum passing score of 72%. This is higher than many other states and reflects the comprehensive nature of California's licensing requirements.
4What is the required contractor bond amount for California C-20 licensees?
A.$10,000
B.$15,000
C.$20,000
D.$25,000
Explanation: California requires a $25,000 contractor's bond for all licensed contractors, including C-20 HVAC contractors. This bond protects consumers against financial loss from the contractor's failure to perform or comply with California contractor law.
5How many years of journeyman-level experience are required for the California C-20 license?
A.2 years
B.3 years
C.4 years within the past 10 years
D.6 years
Explanation: California requires 4 years of journeyman-level experience within the past 10 years for the C-20 license. Up to 3 years of education from an approved program can substitute for experience, but at least 1 year of practical experience is always required.
6What is the California C-20 license application fee?
A.$150
B.$250
C.$350
D.$450
Explanation: The California C-20 license application fee is $450, which includes the exam for one classification. The initial license fee is $200 for individuals or $350 for corporations/LLCs, plus fingerprinting costs of approximately $75.
7Does California require continuing education for C-20 license renewal?
A.Yes, 16 hours annually
B.Yes, 8 hours every 2 years
C.No, California does not currently require CE for contractor license renewal
D.Yes, 24 hours every 4 years
Explanation: As of 2025, the CSLB does not require continuing education for contractor license renewal. However, contractors are responsible for staying current with code changes, and the license must be renewed every two years with the appropriate renewal fee.
8Under California law, what is the 20-day preliminary notice requirement for mechanics' liens?
A.Contractors must wait 20 days before starting work
B.Subcontractors and material suppliers must serve a 20-day preliminary notice to preserve lien rights
C.Contractors have 20 days to complete all work
D.Permits must be obtained 20 days before work begins
Explanation: California's mechanics' lien law requires subcontractors and material suppliers to serve a 20-day preliminary notice on the property owner, general contractor, and construction lender to preserve their lien rights. Without this notice, the right to file a lien may be lost.
9What insurance is mandatory for ALL California C-20 contractors, even those without employees?
A.Only general liability insurance
B.Workers' compensation insurance is mandatory for all C-20 contractors as of January 2023
C.Only automobile insurance
D.No insurance is required for sole proprietors
Explanation: As of January 2023, workers' compensation insurance is mandatory for ALL C-20 HVAC contractors in California, even those without employees. This is a unique requirement for this classification. General liability insurance is also required for LLCs.
10What is the scope of work covered by the California C-20 license?
A.All types of construction
B.Warm-air heating, ventilating, and air-conditioning installation, maintenance, and repair
C.Only refrigeration work
D.Only solar heating
Explanation: The C-20 classification covers warm-air heating, ventilating, and air-conditioning work. This includes installation, maintenance, and repair of forced-air heating systems, central air conditioning, ductwork, ventilation systems, and related controls.

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.

Exam sponsor: California Contractors State License Board (CSLB). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

115 questions

Time Limit

5 hours

Passing Score

72%

Exam / Certification Fees

$450 (application includes exam) + $200 (initial license)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

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

Preparing for the CA C-20 HVAC Exam

What You Need to Know

  • Passing score: 72%
  • Exam length: 115 questions
  • Time limit: 5 hours
  • Exam / certification fees: $450 (application includes exam) + $200 (initial license) Official sources

Using Our Practice Resources

  • Work through all 122 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

CA C-20 HVAC: Suggested Study Strategy

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.