As of January 2025, new regulations have gone into effect regarding the commonly used HVAC refrigerant R-410A. These changes are part of a broader U.S. initiative to improve sustainability and reduce fossil fuel emissions. The transition to the new refrigerant, R-454B, is a significant development—and understandably, it’s raised a few questions for homeowners and business owners alike. If you’re unsure how this affects you, you’re not alone. In this blog, we’ll break down the most common questions we’ve received since the change took effect.

Is the R-454B refrigerant really more efficient?

Yes- although a 2-3% increase in efficiency may not sound like much, the impact is substantial when applied across millions of systems. Here’s what it looks like on a large scale:

  • Energy savings per system: 2.5% of 10,000 kWh = 250 kWh saved per year
  • Total annual energy saved: 250 kWh × 18 million units = 4.5 billion kWh saved
  • Fossil-based portion: 60% of 4.5 billion = 2.7 billion kWh saved from fossil fuels
  • CO₂ savings: 2.7 billion kWh × 0.9 lbs/kWh = ~2.43 billion pounds of CO₂ saved = ~1.1 million metric tons of CO₂ annually


Why is R-454B more energy-efficient?

Without diving too deep into the science, refrigerants work by trapping and transferring heat—either to warm a space or cool it. R-454B does a better job of transferring heat, meaning your HVAC system can achieve the same results with less energy consumption.


Can my R-410A system still be serviced?

Yes. The regulations do not ban the use of R-410A—only the sale of new equipment that uses it. Your existing system can still be maintained and repaired. However, over time, R-410A may become more expensive as production and supply decrease.


Can I retrofit my system to use R-454B?

Unfortunately, no. R-410A and R-454B have very different chemical and pressure requirements. To switch refrigerants, you’d need new, compatible equipment specifically designed for R-454B.


Is R-454B more flammable—and is it safe?

Yes, R-454B is classified as slightly more flammable than R-410A. However, when installed and serviced by licensed HVAC professionals, it is completely safe. Equipment is engineered with built-in safety features, and—as with all refrigerants—open flames should be avoided during service or handling.


Do R-454B systems cost more?

There may be a slight increase in equipment costs due to manufacturing changes, but these are expected to level off over time as production scales.

If you are curious about smart thermostat options or need expert guidance, contact the friendly team at Genove Oil & Air, and we’ll help you find the right solution for your home or business.

Whether you need home heating oil or Bioheat delivery, or installation and service of oil & natural gas systems for HVAC, heating, and cooling—call us at 781-893-9191 or email us.