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If you've heard your HVAC technician mention R-22, R-410A, or something called the AIM Act, you're not alone in wondering what any of it means for your home. The answer starts with something you learned about in school: the ozone layer. Changes to federal law aimed at protecting that layer are directly reshaping the refrigerants used in every air conditioner and heat pump in the Memphis area, and knowing where things stand can help you make smarter decisions the next time your system needs service or replacement.
What Is the Ozone Layer and Why Does It Matter?
The Earth's atmosphere is divided into distinct layers. The layer we live in, the troposphere, extends about 10 kilometers above the surface. Above that sits the stratosphere, which stretches up to about 50 kilometers and is where most commercial aircraft fly. Within the stratosphere, roughly 15 to 30 kilometers up, lies a thin concentration of ozone molecules that collectively form what we call the ozone layer.
Ozone is simply oxygen in a three-atom form (O₃) rather than the two-atom form (O₂) we breathe. Despite being present in tiny amounts (only about 3 out of every 10 million air molecules), the ozone layer performs a critical job: it absorbs ultraviolet B (UVB) radiation from the sun before it reaches the Earth's surface.
When UVB levels rise, the health effects are well documented. Increased UVB exposure is linked to higher rates of non-melanoma and melanoma skin cancers, cataracts, and weakened immune systems. It also harms certain crops and disrupts marine food chains. In Antarctica, where an annual "ozone hole" forms each spring, surface UVB levels have been measured at double their normal values during peak depletion events.
How Do Human Activities Deplete the Ozone Layer?
For decades, the culprit has been a class of chemicals called chlorofluorocarbons (CFCs), and later, hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs). These compounds were prized as refrigerants, solvents, and foam-blowing agents because they are stable, non-flammable, and inexpensive to produce.
That very stability, however, is the problem. Unlike chlorine released by volcanoes or the ocean, which dissolves in water and rains back down quickly, CFCs and HCFCs do not break down in the lower atmosphere. Winds carry them upward into the stratosphere over a process that can take two to five years. Once there, intense UV radiation breaks the molecules apart, releasing chlorine atoms. A single chlorine atom can destroy more than 100,000 ozone molecules through a chain reaction before it is neutralized. Bromine-containing compounds like halons (formerly used in fire extinguishers) are even more destructive; bromine atoms are about 40 times as damaging to ozone as chlorine.
Importantly, natural sources account for only about 15% of stratospheric chlorine. Human-made substances are responsible for the other 85%. The good news: atmospheric measurements confirm that since countries began phasing out the worst offenders, stratospheric chlorine concentrations have started declining. Scientists project that, assuming sustained global compliance, the ozone layer should return to pre-1980 levels by around 2050.
The History of Refrigerant Phase-Outs: From R-22 to What Comes Next
Understanding the current refrigerant landscape requires a brief look at how we got here.
R-22 (Freon): The First Major Phase-Out
R-22 (commonly known by the DuPont brand name Freon) was the dominant refrigerant in residential air conditioners for most of the 20th century. In 1987, the landmark Montreal Protocol, eventually signed by more than 160 countries, committed the world to reducing CFC and HCFC production. Under that agreement and subsequent amendments, the U.S. banned R-22 from use in new HVAC equipment after January 1, 2010, and ended its domestic production and importation entirely as of January 1, 2020. Today, R-22 is available only as reclaimed or recycled stock, and its price has surged accordingly.
If your air conditioner is more than 15 years old and requires a refrigerant recharge, it very likely still uses R-22. Service is still possible, but costs are significantly higher than they once were. You can learn more about your options on our AC Repair page, or reach out to our team about an AC Replacement to move to a modern, compliant system.
R-410A (Puron): Now in Its Own Phase-Down
R-410A (sold under brand names like Puron) was introduced as the ozone-safer successor to R-22. It contains no chlorine and does not deplete the ozone layer. For that reason, it seemed like the perfect solution, and for about 25 years, virtually every new residential air conditioner and heat pump installed in Memphis and across the U.S. was charged with R-410A.
The catch? R-410A is an HFC, and while it doesn't harm the ozone layer, it is a potent greenhouse gas with a global warming potential (GWP) roughly 2,088 times that of carbon dioxide. That distinction matters under a newer law.
The AIM Act: What the Law Says and What It Means for You
In December 2020, Congress passed the American Innovation and Manufacturing (AIM) Act, which gave the EPA authority to phase down HFC production and consumption by 85% over 15 years, targeting 2036 as the endpoint. The AIM Act operates through two mechanisms: a cap-and-trade program that limits how much HFC refrigerant can be produced or imported each year, and a Technology Transitions Program that restricts HFC use in new equipment by sector.
The phasedown stepped down to 60% of baseline in 2024, the sharpest single-year cut, which is the primary reason R-410A wholesale prices rose 40–70% from their 2022 levels and have continued climbing in 2026.
Here are the key milestones that affect homeowners:
- January 1, 2025: Manufacturers were prohibited from producing or importing new residential split-system air conditioners and heat pumps charged with R-410A. This applies to equipment in the under-65,000 BTU category that covers virtually all Memphis homes.
- Pre-2025 inventory: Equipment manufactured before January 1, 2025, carries full manufacturer warranties. The EPA finalized a rule in May 2026 allowing pre-2025 R-410A equipment to continue being installed until existing supplies are exhausted, addressing supply chain delays in the rollout of next-generation refrigerants.
- January 1, 2028: The same restrictions take effect for packaged commercial HVAC units.
- R-410A service refrigerant is not banned. Existing R-410A systems can continue to be repaired and recharged for the foreseeable future. However, as annual production caps tighten through 2028, 2029, and beyond, service refrigerant will become progressively more expensive and harder to source.
For the full regulatory timeline, the EPA's Technology Transitions page is the authoritative source.
What Is Replacing R-410A? Meet A2L Refrigerants
New residential systems manufactured from January 2025 onward use a new class of refrigerants called A2Ls, designated as such because they are mildly flammable (Class 2, Lower flammability) but far less potent as greenhouse gases.
The two you're most likely to encounter in a new Memphis installation are:
- R-454B (Puron Advance): Carrier's primary transition refrigerant, with a GWP roughly 78% lower than R-410A.
- R-32: Used by several manufacturers, with a GWP approximately 68% lower than R-410A.
A2L refrigerants require updated equipment and certified technician training to handle safely due to their mild flammability. All properly licensed HVAC technicians in Tennessee are required by EPA Section 608 regulations to be certified to work with refrigerants, and updated training for A2L handling is now part of industry standards.
What This Means for Memphis Homeowners Right Now in 2026
Memphis summers are brutal. Shelby County routinely logs weeks of 95°F-plus temperatures with high humidity, and a functioning air conditioner isn't a luxury. It's a health necessity.
Here's what to keep in mind given where the refrigerant market stands in 2026:
- If your system uses R-22: You're operating legacy equipment that's almost certainly approaching or past its useful lifespan. Service is still possible but costly. A professional AC Inspection can tell you whether the economics favor continued repair or replacement with a new A2L system. If replacement is the path forward, AirMasters Air Conditioning & Heating serves Memphis, Bartlett, Collierville, Cordova, and Germantown with professional AC Installation.
- If your system uses R-410A: Your system is fully legal to operate and service. Recharging, repairing, and maintaining it remains permitted indefinitely. What will change over time is the cost; service refrigerant pricing will continue climbing as the AIM Act caps tighten through 2029 and beyond. Keeping your system well-maintained is more important than ever: a properly maintained R-410A system uses refrigerant efficiently and is far less likely to need a costly recharge. Our AC Maintenance service and Maintenance Plan are designed with exactly this in mind.
- If you're shopping for a new system: New equipment uses A2L refrigerants. These systems offer lower long-term refrigerant costs, improved energy efficiency, and full compliance with current EPA regulations. Our team can walk you through AC Installation options suited to your home's size and budget.
- Heat pump owners: The same rules apply to heat pumps. Both ozone depletion science and the AIM Act phase-down affect heat pump refrigerants equally. Learn more on our Heat Pump Repair & Installation page.
One more practical tip: Memphis residents should ensure that any HVAC technician working on their system is EPA Section 608 certified. This certification is required by federal law for anyone handling refrigerants, and it guarantees they have the training to recover (not vent) refrigerant during repairs. Venting refrigerants into the atmosphere is both illegal and environmentally harmful. AirMasters Air Conditioning & Heating technicians are fully certified and follow all EPA refrigerant handling requirements.
Frequently Asked Questions
Does the AIM Act mean I have to replace my air conditioner?
No. The AIM Act does not require homeowners to replace working equipment. If your system runs on R-410A or even R-22, you are not required to remove or replace it. What changes is that new systems manufactured from 2025 onward use different refrigerants, and the cost of servicing older systems will gradually increase as supply tightens.
Is R-410A banned?
No. R-410A is not banned. New manufacturing of R-410A residential split systems stopped on January 1, 2025, but the refrigerant itself remains legal to produce, sell, and use for servicing existing equipment. Think of it as a phase-down, not an immediate ban.
What happened to R-22?
R-22 (Freon) was banned from new equipment in 2010 due to its ozone-depleting properties, and domestic production and importation ended in 2020 under the Montreal Protocol. It is still available as reclaimed product for servicing existing systems but is expensive and increasingly scarce.
Will the ozone layer recover?
Yes, according to the scientific consensus. Provided that countries continue complying with the Montreal Protocol, natural ozone production is expected to return the stratospheric ozone layer to pre-1980 levels by approximately 2050. You can find more information at the EPA's ozone layer protection page.
Why does this matter for indoor air quality in my Memphis home?
Refrigerant issues are primarily outdoor environmental concerns, but a leaking HVAC system can reduce cooling efficiency and create comfort problems indoors. If you're concerned about the overall health of your home's air, our Indoor Air Quality services address a full range of pollutants and comfort factors.
What refrigerant will my new AC use?
New residential systems installed in 2025 and beyond use A2L refrigerants, most commonly R-454B or R-32. These have a dramatically lower global warming potential than R-410A while offering equivalent or improved cooling performance.
Ready to Talk to an Expert?
Whether you're trying to understand your service options for an older R-22 or R-410A system, or you're ready to upgrade to a modern, environmentally compliant air conditioner, AirMasters Air Conditioning & Heating is here to help. We've been serving Memphis and the surrounding communities, including Bartlett, Collierville, Cordova, and Germantown, with honest, expert HVAC service for years.
Contact us today to schedule an inspection or learn more about your refrigerant options before Memphis summer hits its peak.