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According to the CSLB, “a warm-air heating, ventilating and air-conditioning 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 air-conditioning unit; and the ducts, registers, flues, humidity and thermostatic controls and air filters in connection with any of these systems. This classification shall include warm-air heating, ventilating and air-conditioning systems which utilize solar energy.”

Requirements for Licensure

The California Contractors State License Board requires a minimum of four years journeyman-level experience in order to apply for a California Contractors license.

Heating, Ventilating & Air-Conditioning Exam (C-20)

The exam is a closed book exam and has approximately 100 questions that must be answered in 2.5 hours. The exams are given on a computer at one of the many testing centers throughout California. An appointment is needed and can be made once an application has been accepted.

Some of the topics covered in the exam include:

  • Evaluation, Design & Estimation
  • Fabrication, Installation & Startup
  • Troubleshooting, Repair & Maintenance
  • Safety

How to Prepare for the Exam

Once the CSLB has approved your application, you will be informed of the testing date. We recommend that you give yourself plenty of time to prepare and study, preferably months. One of the most effective ways to prepare for the exam is by using the Peerless HVAC (C-20) Study Guide book. The book includes hundreds of pages of relevant content that is covered on the state exam and also loaded with close to a thousand multiple choice questions.