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Each section targets specific HVAC tasks such as system design, load and psychrometric calculations, duct layout, equipment installation, diagnostics, maintenance, and jobsite safety requirements.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What are the testing rules for the exam?",{"text":117,"@type":113},"The exam is closed-book, so no reference materials may be used during testing. It is multiple-choice with four choices per question, and only one BEST answer is correct. A calculator is provided, there is no penalty for guessing, and leaving questions blank is discouraged.",{"name":119,"@type":110,"acceptedAnswer":120},"What do the sample questions demonstrate about the exam style?",{"text":121,"@type":113},"The sample questions show that the exam includes quantitative ventilation calculations, equipment safety/control concepts like thermocouples, and system-component identification such as packaged water-source heat pump elimination of specific parts. Correct answers are marked with an asterisk.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},319705,1790039791,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":46,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":81,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":39,"preview_page_count":4},137451211410,"https://ap-avatar.wpscdn.com/avatar/2000bb0a9246f588df?x-image-process=image/resize,m_fixed,w_180,h_180&k=1786362646172706240","FOR EXAMINATIONS SCHEDULED ON OR AFTER APRIL 1, 2026  \n\n| | CONTRACTORS STATE LICENSE BOARD LICENSE EXAMINATION STUDY GUIDE |  | |\n| --- | --- | --- | --- |\n| \u003Cbr>WARM-AIR HEATING, VENTILATING AND AIR-CONDITIONING (C-20) |  |  |  |\n| Content of the Examination\u003Cbr>The Warm-Air Heating, Ventilating and\u003Cbr>Air-Conditioning (C-20) Examination is divided into four major sections:\u003Cbr>1. Planning and Estimating (22%)\u003Cbr>• HVAC system design and evaluation\u003Cbr>• Load and psychrometric calculations\u003Cbr>• Duct system design and layout\u003Cbr>• Job cost estimation\u003Cbr>2. Fabrication, Installation, and Startup (38%)\u003Cbr>• Duct system fabrication\u003Cbr>• Equipment installation\u003Cbr>• Electrical and mechanical components\u003Cbr>• Plumbing and refrigeration components\u003Cbr>• Air distribution and duct systems\u003Cbr>• HVAC system startup\u003Cbr>3. Troubleshooting, Repair, and Maintenance (20%)\u003Cbr>• HVAC system diagnostic tests and evaluation\u003Cbr>• HVAC system maintenance and repair\u003Cbr>4. Safety (20%)\u003Cbr>• Personal protective equipment (PPE)\u003Cbr>• Job site safety requirements (Cal/OSHA)\u003Cbr>• Handling hazardous materials\u003Cbr>*Percentages are approximate * |  | Test Policy\u003Cbr>This is a closed-book examination. No reference materials may be used during the examination.\u003Cbr>Test Strategy\u003Cbr>This is a multiple-choice examination with four choices per question. Examination questions are written to provide only one BEST answer. Some questions require mathematical computation. A calculator will be provided.\u003Cbr>There is no penalty for guessing. If you are unsure about a particular question, it is better to answer the question than to leave the question blank.\u003Cbr>Plenty of time is provided to answer all examination questions. Read each question and its four choices completely and carefully before selecting the BEST possible answer. |  |\n\n\n| Sample Questions\u003Cbr>Below are three typical examination questions. The correct answer is marked with an asterisk (*) .\u003Cbr>1. A storage garage needs four air changes per hour for proper ventilation. How many ventilators are needed to exhaust the garage if it has a total volume of 180,000 cubic feet anda ventilator will exhaust 1,000 cubic feet per minute?\u003Cbr>a. 6\u003Cbr>b. 12*\u003Cbr>c. 18\u003Cbr>d. 180\u003Cbr>2. What is the function of a thermocouple in a gas furnace?\u003Cbr>a. It is a safety control for the fan.\u003Cbr>b. It is a safety device that confirms the existence of a pilot flame.*\u003Cbr>c. It is a safety device for electronic ignition systems.\u003Cbr>d. It is a safety device that controls the thermostat.\u003Cbr>3. A packaged water source heat pump eliminates which of the following components?\u003Cbr>a. Capacitor\u003Cbr>b. Evaporator\u003Cbr>c. Reversing valve\u003Cbr>d. Air-cooled condenser*\u003Cbr>*All questions are written and reviewed by licensed contractors who are actively working in the trade * | Resources\u003Cbr>Publisher information for reference books and code is provided below. Other sources for reference books may be found online.\u003Cbr>California code books can be viewed online: [www.dgs.ca.gov/bsc](www.dgs.ca.gov/bsc)\u003Cbr>2025 Building Energy Efficiency Standards for Residential and Nonresidential Buildings. California Energy Commission. PHONE: (800) 772-3300\u003Cbr>[INTERNET: www.energy.ca.gov](INTERNET: www.energy.ca.gov)\u003Cbr>2025 California Building Code. California Code of Regulations, Title 24. International Code Council.\u003Cbr>PHONE: (800) 786-4452\u003Cbr>[INTERNET: www.iccsafe.org](INTERNET: www.iccsafe.org)\u003Cbr>2025 California Electrical Code. California Code of Regulations, Title 24. BNI Publications, Inc.\u003Cbr>PHONE: (888) 264-2665\u003Cbr>[INTERNET: www.bnibooks.com](INTERNET: www.bnibooks.com)\u003Cbr>2025 California Energy Code. California Code of Regulations, Title 24. International Code Council.\u003Cbr>PHONE: (800) 786-4452\u003Cbr>[INTERNET: www.iccsafe.org](INTERNET: www.iccsafe.org)\u003Cbr>2025 California Mechanical Code. California Code of Regulations, Title 24. International Association of Plumbing and Mechanical Officials (IAPMO) .\u003Cbr>PHONE: (909) 472-4100\u003Cbr>INTERNET: [iapmo.org](iapmo.org)\u003Cbr>2025 Calif","cbCaiiFDkTp2YwPd","https://ap.wps.com/l/cbCaiiFDkTp2YwPd","pdf",255547,"English","# Content of the Examination\n## Planning and Estimating\n## Fabrication, Installation, and Startup\n## Troubleshooting, Repair, and Maintenance\n## Safety\n# Test Policy\n## Test Strategy\n# Sample Questions\n# Resources","[{\"question\":\"How is the C-20 examination organized and what topics are covered?\",\"answer\":\"The C-20 exam is divided into four major sections: Planning and Estimating, Fabrication/Installation/Startup, Troubleshooting/Repair/Maintenance, and Safety. Each section targets specific HVAC tasks such as system design, load and psychrometric calculations, duct layout, equipment installation, diagnostics, maintenance, and jobsite safety requirements.\"},{\"question\":\"What are the testing rules for the exam?\",\"answer\":\"The exam is closed-book, so no reference materials may be used during testing. It is multiple-choice with four choices per question, and only one BEST answer is correct. A calculator is provided, there is no penalty for guessing, and leaving questions blank is discouraged.\"},{\"question\":\"What do the sample questions demonstrate about the exam style?\",\"answer\":\"The sample questions show that the exam includes quantitative ventilation calculations, equipment safety/control concepts like thermocouples, and system-component identification such as packaged water-source heat pump elimination of specific parts. Correct answers are marked with an asterisk.\"}]","C-20 Warm-Air Heating, Ventilating and Air-Conditioning License Examination Study Guide - Exam Preparation | PDF",1789946446]