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200+ DC JOURNEYMAN A/C & REFRIGERATION (312) PRACTICE EXAM Q&A | HVAC/R LICENSING PREP WITH RATIONALES | 2026 UPDATE
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136

May 2026

2025/2026

A+
Pass your District of Columbia Journeyman A/C & Refrigeration (312) exam on the first try with this 2026-updated practice guide featuring 200+ realistic questions and detailed rationales. Covers refrigeration cycle components (compressor, condenser, evaporator, expansion valve), superheat/subcooling, refrigerants (R-22, R-410A, R-134a, R-404A, HFOs), EPA regulations, electrical fundamentals (motors, contactors, capacitors, relays, thermostats), schematics, load calculations, piping practices (oi...
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