CSLB HVAC (C-20) Trade
Free practice for the CSLB HVAC (C-20) Trade exam. Original questions in English, 中文 and Español, covering the official content areas — with a full timed mock exam.
The CSLB HVAC (C-20) Trade exam is about 100 questions, 210 minutes, 72% to pass. Practice by topic here, then take the full timed mock exam to gauge your readiness. Free, no signup.
▶ Practice questions
Learn by topic with instant explanations. Free, no signup.
🎯 Full timed mock exam
A 100-question, 210-minute simulation to test your readiness.
What the CSLB HVAC (C-20) Trade exam covers
27%
Installation
20%
Load & Design
20%
Refrigeration
17%
Service & Troubleshooting
16%
Safety & Codes