NCCER HVACR Practice Questions - NCCER HVACR HVAC Technician Exam

What is the most common refrigerant used in new residential air conditioning systems installed in the United States in 2026?

R-22 R-410A R-32 or R-454B (A2L low-GWP refrigerants) R-12

R-32 or R-454B (A2L low-GWP refrigerants)

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