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A C-38 Refrigeration license authorizes constructing, installing, and servicing refrigeration systems that control temperatures below 50°F (10°C), under 16 CCR §832.38 — that 50°F line is what separates C-38 from the broader C-20 HVAC classification. Read the complete C-38 exam guide for requirements and exam structure.
C-38 overlaps two adjacent trades along clean lines: C-36 Plumbing covers the drain and water lines feeding a refrigeration unit (the unit itself is C-38 scope), and C-10 Electrical covers the power connections and controls that run the equipment. The CSLB C-38 trade exam weights Planning and Estimating alongside Refrigeration System Installation as its two largest content areas.