An HVAC refrigerant is the chemical compound that moves heat through your air conditioner or heat pump, soaking up heat inside your home and releasing it outdoors as it cycles between liquid and gas. The types you are most likely to find in a Colorado home are R-22, R-410A, and the newer low-impact A2L refrigerants R-454B and R-32.

Refrigerant is federally regulated, and only EPA-certified technicians can legally buy, charge, or recover it. The overview below comes from the licensed team at 1st Choice Pro Services in Parker, and it is meant to help south Denver metro homeowners understand what is running through their system – not to guide a do-it-yourself repair.

How Refrigerant Actually Cools Your Home

Refrigerant works by changing state. Inside your home, low-pressure liquid refrigerant passes through the evaporator coil, boils into a gas, and pulls heat out of the indoor air. That gas travels to the outdoor unit, where the compressor raises its pressure and the condenser coil dumps the heat outside before the refrigerant turns back into a liquid and starts over. The same cycle runs in reverse in a heat pump to warm your home in winter.

Because it operates in a sealed loop, refrigerant is never consumed. A system that is low on refrigerant almost always has a leak, not a level that naturally ran down over time. That distinction matters: “adding a pound of refrigerant” without finding the leak is a temporary fix that will fail again, usually at the worst time.

The Main Types of HVAC Refrigerants

Homeowners in Parker, Castle Rock, Centennial, and Highlands Ranch typically have one of a handful of refrigerants in their equipment, depending on how old the system is.

R-22 (HCFC, sold as “Freon”)

R-22 was the residential standard for decades and is still in many air conditioners installed before roughly 2010. Because it depletes the ozone layer, its production and import were banned in the United States on January 1, 2020. R-22 has not disappeared, but the only supply left is reclaimed and recycled gas, which is why servicing an R-22 leak now often costs several hundred dollars just for the refrigerant. If you have an older R-22 system in a Castle Pines or Centennial home, a major refrigerant leak is usually the point where replacement makes more financial sense than repair.

R-410A (HFC, often called “Puron”)

R-410A replaced R-22 and has been the dominant residential refrigerant for the last two decades. It contains no chlorine, so it does no ozone damage, and it runs at a higher pressure than R-22 – which is exactly why the two are not interchangeable. R-410A works well, but it has a high global warming potential, and that is what put it on the phase-down list.

R-454B and R-32 (A2L refrigerants, the new standard)

As of January 1, 2025, EPA rules under the AIM Act require new residential air conditioners and heat pumps to use refrigerants with a much lower global warming potential. Manufacturers have standardized on two options: R-454B and R-32. Both are classified A2L, meaning they are mildly flammable and low in toxicity. That classification calls for updated leak detection, different gauges, and specific handling procedures, so A2L work is not the same as topping off an old R-410A unit. Almost any new system installed on the Front Range today ships with one of these two refrigerants.

HFOs and natural refrigerants

Hydrofluoroolefins (HFOs) such as R-1234yf carry an extremely low global warming potential and are common in newer car air conditioning and in refrigerant blends. Natural refrigerants like carbon dioxide and ammonia show up mostly in commercial and industrial systems rather than in a typical home.

Quick Comparison of Common Refrigerants

Refrigerant	Class	Ozone Impact	Approx. GWP	Where You’ll See It
R-22	HCFC	High (ozone-depleting)	~1,810	Systems installed before ~2010
R-410A	HFC	None	~2,088	Most systems from ~2010 to 2024
R-454B	HFC/HFO blend (A2L)	None	~466	New systems from 2025 on
R-32	HFC (A2L)	None	~675	New systems from 2025 on

Global warming potential (GWP) compares a refrigerant’s heat-trapping effect to carbon dioxide over 100 years, so a lower number is better. The values above are widely published approximations and help explain why the industry moved away from R-410A.

What the 2025 Change Means for Front Range Homeowners

If your air conditioner or heat pump is working fine, the refrigerant transition does not force you to do anything. You do not need to replace an R-410A system just because R-454B is now the standard, and you can keep servicing R-410A equipment for years to come. The change matters mainly when you buy a new system.

New installations in Parker and the surrounding south Denver metro now come charged with R-454B or R-32. That is worth knowing here specifically because our climate leans hard on this equipment: dry, sunny summers push air conditioners through long runtimes, and cold, snowy winters have made cold-climate heat pumps a popular choice – all of which now run on A2L refrigerant. One practical takeaway is that R-410A and A2L refrigerants cannot be mixed, so an aging R-410A system cannot simply be “converted.” When it reaches the end of its life, its replacement will be an A2L system by default.

Signs of a Refrigerant Problem

Since refrigerant does not get used up, these symptoms usually point to a leak or a charge that was never set correctly:

Air conditioning that blows warm or only slightly cool air on a hot afternoon
Ice or frost forming on the copper line or the indoor coil
A hissing or bubbling sound near the lines or the outdoor unit
Longer runtimes and higher summer electric bills for the same comfort
A heat pump that struggles to keep up on a cold Front Range morning

A leak is not just a comfort issue. Running a compressor with a low charge can overheat and destroy it, turning a repair into a full replacement.

Why Refrigerant Work Is Not a DIY Job

Federal law under the Clean Air Act requires EPA Section 608 certification to purchase and handle refrigerant, and venting it into the atmosphere is illegal. Beyond the legal side, the work is genuinely technical: a system needs the exact charge listed on the nameplate, measured by pressure and temperature, and A2L refrigerants add flammability precautions on top of that. The retail “recharge kits” sold for cars have no place in a home HVAC system. A trained technician finds the leak, repairs it, evacuates the system, and weighs in the correct charge so the fix lasts.

Frequently Asked Questions

Is R-22 still available for my old system?

Yes, but only as reclaimed or recycled gas, since new production and import were banned in 2020. It is available and legal to use, just increasingly expensive. For many older systems, a large R-22 leak is the moment to weigh repair against replacement.

Do I have to replace my R-410A system now?

No. The 2025 rules apply to new equipment being manufactured, not to systems already in your home. You can keep running and servicing an R-410A air conditioner or heat pump. When you eventually replace it, the new unit will use R-454B or R-32.

Are R-454B and R-32 safe if they are flammable?

They are rated A2L, which means mildly flammable and low toxicity – a much lower fire risk than propane or gasoline. Manufacturers design the equipment, and technicians follow specific handling and leak-detection procedures, to keep that risk controlled. For a homeowner, a properly installed A2L system is safe to live with.

How often does refrigerant need to be topped off?

Never, in a healthy system. Refrigerant circulates in a sealed loop and is not consumed. If a technician tells you the system is low, the real problem is a leak that should be located and repaired, not just refilled.

Talk to a Licensed Parker HVAC Team

Whether you are nursing an older R-22 unit, wondering about the switch to R-454B, or noticing warm air and higher bills, refrigerant issues are best handled by certified professionals. 1st Choice Pro Services is a licensed, bonded, and insured plumbing and HVAC contractor serving Parker, Castle Rock, Castle Pines, Centennial, and Highlands Ranch. Call us to diagnose a suspected leak, evaluate whether to repair or replace, and get straight answers about the refrigerant in your system.