R32 vs R454B: Which Refrigerant is Right for Your Commercial HVAC Project?
Complete comparison of R-32 and R-454B refrigerants for commercial HVAC, including GWP, safety classification, equipment availability, and handling requirements.
Background: R-410A Phase-Down
The AIM Act mandates the phase-down of HFC refrigerants including R-410A (GWP 2,088). New commercial AC and heat pump equipment manufactured after January 2025 must use refrigerants with GWP below 700. Two refrigerants have emerged as the primary replacements.
R-32 Properties
- GWP: 675
- Type: Single-component refrigerant
- Safety classification: A2L (mildly flammable)
- Used by: Daikin
- Available tonnage: 1 to 25 ton commercial packaged units
R-32 is a single-component refrigerant, which means it does not fractionate during leaks. This simplifies leak detection and refrigerant recovery. Daikin has been the global pioneer in R-32 commercial HVAC technology.
R-454B Properties
- GWP: 466
- Type: Zeotropic blend (R-32 + R-1234yf)
- Safety classification: A2L (mildly flammable)
- Used by: Carrier, Goodman, ACiQ, Trane
- Available tonnage: 2 to 10 ton commercial packaged units
R-454B has a lower GWP than R-32, making it the most environmentally friendly option. As a zeotropic blend, it has a temperature glide during phase change, which requires specific handling considerations.
Handling Differences
Both refrigerants are A2L classified and require similar safety precautions. Key differences for contractors:
- Leak detection: Use detectors calibrated for the specific refrigerant
- Recovery equipment: Must be rated for A2L refrigerants
- Charge weight: R-32 systems typically use less charge than equivalent R-454B systems
- Tool compatibility: Most standard HVAC tools work with both refrigerants
How to Choose
Your refrigerant choice is primarily determined by your equipment brand preference:
- If you prefer Daikin, specify R-32
- If you prefer Goodman, Carrier, or Trane, specify R-454B
Both refrigerants are AIM Act compliant. Both provide efficient, reliable operation in commercial HVAC applications. The choice between them should be based on brand preference, tonnage requirements, and project specifications.
Learn more about AIM Act compliance at our AIM Act guide.
