Refrigerant Types Guide
General reference for common HVAC and refrigeration refrigerants including R-22, R-410A, R-32, R-454B, R-134a, R-407C, R-404A, and R-744 CO₂.
Important Refrigerant Notice
This guide is provided for general informational purposes only. Refrigerant selection, handling, recovery, charging, installation, servicing, and disposal must follow applicable laws, safety standards, manufacturer instructions, EPA requirements, and qualified professional procedures.
Common HVAC Refrigerants
R-22
Type: HCFC
Safety Class: A1
Common Use: Older residential and light commercial systems.
Status: Legacy refrigerant. Use and service availability depend on applicable regulations and supply conditions.
R-410A
Type: HFC blend
Safety Class: A1
Common Use: Existing residential and commercial split systems.
Status: Existing equipment may still require service support, but new-equipment refrigerant rules are changing.
R-32
Type: HFC
Safety Class: A2L
Common Use: Mini-splits, heat pumps, and newer HVAC equipment.
Note: A2L refrigerants require appropriate tools, training, safety procedures, and manufacturer guidance.
R-454B
Type: HFO/HFC blend
Safety Class: A2L
Common Use: Newer residential and light commercial HVAC equipment.
Note: Often used as a lower-GWP replacement direction for equipment previously designed around R-410A.
R-134a
Type: HFC
Safety Class: A1
Common Use: Automotive applications, chillers, and selected refrigeration systems.
Status: Transition considerations vary by application and regulation.
R-407C
Type: HFC blend
Safety Class: A1
Common Use: Commercial air conditioning and some retrofit applications.
Note: Compatibility must be confirmed before retrofit or replacement use.
R-404A
Type: HFC blend
Safety Class: A1
Common Use: Legacy commercial refrigeration applications.
Status: High-GWP refrigerant. Replacement and service decisions should follow applicable regulations and manufacturer guidance.
R-744 / CO₂
Type: Natural refrigerant
Safety Class: A1
Common Use: Commercial refrigeration and selected heat pump applications.
Note: CO₂ systems operate differently from traditional HVAC systems and require proper system-specific training.
A2L Refrigerant Considerations
Mildly Flammable Classification
A2L refrigerants are classified as lower-flammability refrigerants and require appropriate handling procedures, tools, labeling, ventilation, and safety practices.
Equipment Compatibility
Refrigerant type must match the equipment design and manufacturer requirements. Do not substitute refrigerants without proper evaluation and documentation.
Regulatory Review
Refrigerant rules, equipment requirements, and phase-down timelines can change. Verify current requirements with official regulatory sources and manufacturer documentation.
Refrigerant Guide FAQs
What is an A2L refrigerant?
A2L refrigerants are lower-flammability refrigerants used in newer HVAC and refrigeration equipment. They require proper tools, training, labeling, and safety procedures.
Can R-410A equipment use R-454B or R-32?
Do not substitute refrigerants unless the equipment manufacturer specifically allows it. Refrigerant compatibility depends on system design, components, oil, controls, labeling, and regulations.
Is this guide a substitute for EPA or manufacturer guidance?
No. This guide is informational only. Always follow applicable laws, EPA requirements, safety standards, and manufacturer documentation.
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