Refrigerant,Nominal composition,GWP used by EPA,Allowance draw per kg (MTEVe per metric ton),Draw relative to R-410A,Status for new residential split systems
R-410A,"50% HFC-32, 50% HFC-125","2,088","2,087.5",1.00,Blocked for new self-contained units and post-2024 split parts; service use and pre-2025 inventory allowed
R-454B,"68.9% HFC-32, 31.1% HFO-1234yf",465,465.1,0.22,Below the 700 limit; main replacement chosen by most U.S. OEMs per EPA
R-32 (HFC-32),100% HFC-32,675,675,0.32,Below the 700 limit
HFO-1234yf,single component,1,0 (not a listed HFC),0.00,Not a regulated substance