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CSLB exam preparation
C-20 HVAC Contractor Exam Prep
Practice HVAC estimating, system fabrication and installation, troubleshooting, maintenance, and safety.
About this exam
CXP's current C-20 bank contains 201 practice questions. Begin with a free diagnostic and use your results to plan review across heating, ventilation, air conditioning, and safety.
The current C-20 guide applies to exams scheduled on or after April 1, 2026, and lists approximate section percentages. The 100-question mock is CXP's practice format, not a claim about the official exam's item count.
- Practice bank size: 201 questions
- Mock exam size: 100 questions
Official CSLB study-guide topics
- Planning and Estimating — Approximate exam percentage: 22%
- Fabrication, Installation, and Startup — Approximate exam percentage: 38%
- Troubleshooting, Repair, and Maintenance — Approximate exam percentage: 20%
- Safety — Approximate exam percentage: 20%
Exam topics and approximate weights: CSLB study guide.
Sample question
What is the total estimated equipment cost for a commercial HVAC replacement project requiring three 5-ton package units at $4,200 each, and 120 linear feet of spiral duct at $12 per foot?
- $13,440
- $15,120 overall
- $16,240 estimated
- $14,040 total
Show answer and explanation
Correct answer: $14,040 total
Explanation: Calculate the package-unit cost first: 3 × $4,200 = $12,600. Then calculate the spiral-duct cost: 120 × $12 = $1,440. The total is $12,600 + $1,440 = $14,040, so the choice stating $14,040 total is correct. The $13,440, $15,120, and $16,240 choices are respectively $600 low, $1,080 high, and $2,200 high. No California statute establishes this arithmetic; B&P Code §7058 addresses contractor classification, while the estimate must follow the project scope and contract documents.
The CXP prep module
Trade exam preparation for C-20 heating, ventilation, and air conditioning.
- A practice question bank and timed mock exam for this module.
- A Readiness Score to track progress by topic.
- Questions and explanations available in English and Spanish.
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Start with a free diagnostic
Use the free diagnostic to find your starting point before choosing what to study.