HVAC & Refrigeration Tools

Free HVAC and refrigeration tools: refrigerant selector, GWP database, refrigerant comparison, and CO2 emissions calculator. All calculations run in your browser.

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Choosing the Right Refrigerant in the Era of F-Gas Regulation

The HVAC industry is in the middle of its largest refrigerant transition in decades. Legacy hydrofluorocarbon blends such as R-410A (GWP ≈ 2,088, AR4) are being phased down worldwide, pushed out by the EU F-gas Regulation, the US AIM Act, and the Kigali Amendment to the Montreal Protocol. In the EU, split air-conditioning systems using refrigerants with a GWP of 150 or more have been banned from the market since 2025, which effectively ends new installations of R-410A equipment there. Lower-GWP replacements such as R-32 (GWP ≈ 675) and R-454B are now the default for new splits, while R-290 (propane, GWP ≈ 3) is increasingly used in heat pumps and monobloc units.

Choosing a refrigerant is always a trade-off between environmental impact, safety class, and performance. Under ASHRAE Standard 34, refrigerants are classified by toxicity (A = lower, B = higher) and flammability (1 = no flame propagation, 2L = lower flammability, 3 = higher flammability). R-410A and R-134a are A1 (non-flammable), R-32 and R-454B are A2L (mildly flammable, require specific design provisions), and hydrocarbons like R-290 and R-600a are A3 (flammable, charge-limited). The right answer depends on the application: a residential split, a supermarket rack, and a chiller each face different charge limits, occupancy classes, and code requirements.

The tools in this hub help you work through that decision systematically: the Refrigerant Selector filters by region legislation, application, and safety class; the GWP Database covers 40+ refrigerants with global warming potential, ODP, and leak-cost calculations; the Compare tool puts two refrigerants side by side (boiling point, glide, oil compatibility, regulatory status); and the CO2 Emissions Calculator converts refrigerant leakage into CO2-equivalent tonnes for reporting and ESG documentation.

Refrigerant & F-Gas FAQ

What does GWP mean for refrigerants?
GWP (Global Warming Potential) expresses how much heat a gas traps in the atmosphere over 100 years relative to the same mass of CO2 (GWP = 1). A refrigerant with GWP 2,088, like R-410A, therefore has roughly 2,000 times the warming impact of a CO2 leak of the same mass. Regulators use GWP thresholds to phase down high-impact gases; our GWP database lists values for 40+ refrigerants.
Can I still buy R-410A equipment?
It depends on the region. In the EU, split systems using refrigerants with GWP ≥ 150 (which includes R-410A) can no longer be placed on the market since 2025 under the F-gas Regulation. In the US, new residential systems are transitioning to R-454B and R-32 under the AIM Act technology transitions. Existing R-410A systems can continue to operate and be serviced with reclaimed or recycled refrigerant, but prices for virgin R-410A rise as the phase-down quota shrinks.
What is the difference between A1, A2L and A3 refrigerants?
These are ASHRAE 34 safety classes. The letter covers toxicity (A = lower toxicity, B = higher toxicity) and the number covers flammability: A1 refrigerants such as R-410A do not propagate flame, A2L refrigerants such as R-32 burn slowly with low burning velocity, and A3 refrigerants such as R-290 (propane) are highly flammable. A2L and A3 systems must follow charge limits, leak-detection, and installation provisions defined in standards like EN 378 and ASHRAE 15.
How do I calculate CO2-equivalent emissions from a refrigerant leak?
Multiply the leaked mass (in kilograms) by the refrigerant's GWP and divide by 1,000 to get tonnes of CO2-equivalent: CO2e [t] = mass [kg] × GWP ÷ 1,000. For example, a 2 kg leak of R-410A equals roughly 4.2 tonnes of CO2e. The CO2 Emissions Calculator in this hub performs this conversion and also covers electricity and fuel emissions.
What is temperature glide and why does it matter?
Zeotropic blends (like R-407C or R-454B) are mixtures that evaporate and condense over a small temperature range instead of at a single point — this range is the glide. Glide matters when charging systems (liquid must be charged to avoid fractionation, i.e. the components evaporating at different rates) and when comparing measured pressures to saturation tables. Azeotropic blends and single-component refrigerants like R-32 have no glide.
Is R-32 a good drop-in replacement for R-410A?
No — R-32 is not a drop-in replacement. It has about 5–10% higher capacity and different pressure/temperature characteristics, so systems must be designed for it: different expansion device sizing, compressors rated for R-32, and A2L-compliant electrical components. Converting an R-410A system to R-32 is not approved by manufacturers and may violate safety codes. For existing R-410A equipment, service with R-410A or consult the manufacturer about approved alternatives.