California
(C-20) Warm-Air Heating, Ventilation
and Air-Conditioning

Apply for the License and Exam

Contractors State License Board
9821 Business Park Drive
P.O. Box 26000
Sacramento, CA 95826
Phone: (800) 321-2752
Outside CA: (916) 255-3900
www.cslb.ca.gov

Exam Type

CLOSED BOOK

Exam Content

Subject Areas	% of Questions
System Evaluation and Design	15
Fabrication	5
System Installation and Start Up	33
Service, Maintenacnce and Repair	37
Safety	10

Time Allowed (hours)	2.5
Passing Grade:	Pass/Fail

California does not publish the number of test questions nor the passing score. According to Blueprint for Becoming a California Licensed Contractor, "You will be informed at the test site about the percentage of correct answers needed to pass each examination."

The qualifying individual for a contractor’s license is required to pass the written Law and Business and trade examinations unless he or she meets the requirements for a waiver.

Part of this exam requires knowledge of business management principles. We offer those study materials on a separate California Law and Business web page.

25% Discount Notice

Books NOT Allowed in the Exam

1.	Modern Refrigeration and Air Conditioning, 18th Edition, 2004, Althous, Turnquist, Bowditch, Bracciana.
2.	HVAC Duct Construction Standards - Metal and Flexible, 3rd Edition, 2005, Sheet Metal and Air Conditioning Contractors' National Association.
3.	Heating and Cooling Essentials, Jerry Killenger, LaDonna Killenger.
4.	California Building Code (California Code of Regulations, Title 24, Part 2), 2007, (based on the 2006 International Building Code), ICC.
5.	California Electrical Code (California Code of Regulations, Title 24, Part 3), 2007, (based on the 2005 NEC), National Fire Protection Association.
6.	California Mechanical Code (California Code of Regulations, Title 24, Part 4), 2007, (based on 2006 Uniform Mechanical Code), IAPMO.
7.	California Plumbing Code (California Code of Regulations, Title 24, Part 5), 2007, (based on the 2006 Uniform Plumbing Code), IAPMO.
8.	Cal/OSHA Construction Safety Orders, California Code of Regulations, Title 8, Division 1 - Industrial Relations, Chapter 4, Subchapter 4.
9.	Manual D - Residential Duct Systems, 1995, Air Conditioning Contractors of America.
10.	Manual J - Residential Load Calculations, 2002, Air Conditioning Contractors of America.
11.	Manual H - Heat Pump Systems, Air Conditioning Contractors of America.
12.	Manual P, Psychrometrics: Theory and Applications, Air Conditioning Contractors of America.
13.	Commercial Applications, Systems and Equipment (Manual CS), Air Conditioning Contractors of America.
14.	Manual RS, Comfort, Air Quality, & Efficiency By Design, Air Conditioning Contractors of America.
15.	Study Guide for EPA Section 608 Test (10A-SG), Air Conditioning Contractors of America.
16.	Refrigerant Transition and Recovery Certification Program Manual for Technicians, Delta T. Solutions.

Recommended Study Materials

California • (C-20) Warm-Air Heating, Ventilation
and Air-Conditioning

Product Name	Price
Comprehensive Tutorial
Practice Tests ( 3 )
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