What Is R-454B?
R-454B is a mildly flammable A2L coolant sold as Puron Advance and Opteon XL41. Major brands like Carrier, Trane, and Lennox have used it in new units since 2025.
HVAC Buyer Guide 2026
R-454b Refrigerant Sacramento Homeowners
As of January 2026, new AC units can no longer use R-410A. R-454B is the new coolant. Fresh Air now installs only R-454B and R-32 systems in Sacramento.
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R-454B Coolant: What Sacramento Homeowners Need to Know in 2026
The EPA ended R-410A for new units on January 1, 2026. New systems now run on A2L coolants like R-454B or R-32. These have a climate impact about 75% lower than R-410A. If your old unit fails this summer, your new one will use these coolants. Fresh Air has been ready for this since 2025 and has placed 900+ units since 2009.
Is It Safe?
A2L coolants are mildly flammable only under a specific mix of ignition and limited air. Modern units include leak sensors that shut down the unit if a leak happens.
What About My Old R-410A Unit?
If your unit uses R-410A, you do not need to act now. R-410A parts and coolant stay available for service. Only new units made after January 1, 2026 must use A2L coolants.
Key Facts About R-454B for Sacramento Homeowners
- EPA rule: new AC units with a climate score over 700 cannot be made or imported for US sale since January 1, 2026.
- R-454B climate score: R-454B rates at about 148, compared to 2,088 for R-410A.
- Compatibility: you cannot mix R-454B with R-410A. Each unit uses its own coolant only.
- New unit cost: R-454B units cost about 5 to 10% more than R-410A models due to updated safety features.
- Service: R-410A parts and coolant stay available for existing units.
- Rebates: some programs offer rebates for A2L units in 2026; check current amounts at smud.org.
What This Means When You Replace Your AC in Sacramento
If you replace an AC or heat pump in 2026, your new unit will use R-454B or R-32. Fresh Air stocks units from many brands and walks you through the specs before you choose. All new units include built-in leak sensors as required by current safety codes.
Coolant cost for service on new A2L units is slightly higher than R-410A. The lower climate impact helps California hit its goals. Fresh Air is CSLB licensed #945361 and family-run since 2009. We only quote systems that meet current EPA and Title 24 rules.
R-454b Refrigerant Sacramento Homeowners FAQ
Do I have to swap my R-410A unit now?
No. The rule only covers new units made or imported after January 1, 2026. Your existing R-410A unit can still be serviced with R-410A coolant and parts.
Is R-454B safe in my home?
Yes, under normal use. R-454B is A2L class, which means mildly flammable only under very specific conditions. New units include leak sensors and auto shutoffs.
Will R-454B cost more to service than R-410A?
A bit more per pound of coolant, yes. But a well-installed unit rarely needs a top-up. Fresh Air checks for leaks on every tune-up.
Does Fresh Air install R-454B systems in Sacramento?
Yes. Fresh Air now installs only R-454B and R-32 systems in Sacramento and across the valley and foothills. Call (916) 416-8181 for a free estimate.
Ready for a New R-454B System? Start Here.
Call Fresh Air Heating and Air at (916) 416-8181 or book at our contact page. We serve Sacramento, Elk Grove, Folsom, Roseville, Rocklin, and the greater Sacramento Valley. Free in-home estimate and milestone billing.