Yes, heat pumps contain refrigerant, but modern units use alternatives to the older freon

Heat pumps need a refrigerant to move heat between indoors and outdoors—that's how they warm or cool your home. Older heat pumps used R-22 refrigerant, commonly called freon, but the U.S. Environmental Protection Agency (EPA) phased out R-22 production in 2020 because it damages the ozone layer. If you have a heat pump made before 2010, it likely contains R-22. If it was made after 2010, it almost certainly uses a newer refrigerant like R-410A, R-32, or R-454B.

The refrigerant sits inside sealed copper tubing that runs through your indoor and outdoor units. You won't see it or interact with it during normal operation. The only time refrigerant matters to you is if your system develops a leak, needs servicing, or reaches the end of its life—and even then, a technician handles the work.

Key Takeaways

  • Heat pumps use refrigerant to transfer heat, but modern units contain R-410A, R-32, or R-454B instead of the older R-22 freon that was phased out in 2020.
  • The refrigerant circulates in sealed copper tubes inside your heat pump and you will not see it or need to refill it under normal operation.
  • If your heat pump is leaking refrigerant, you will notice reduced heating or cooling power, and a technician must locate and repair the leak.
  • Older heat pumps with R-22 refrigerant can still be serviced, but technicians must use reclaimed R-22, which costs more than newer refrigerants.

What refrigerant your heat pump contains depends on when it was manufactured

The age of your unit is the clearest indicator of which refrigerant it holds. Heat pumps made before 2010 almost always use R-22 (freon). Units manufactured between 2010 and 2015 typically use R-410A. Newer models, especially those made after 2020, may use R-32 or R-454B, which are more efficient and have lower environmental impact than R-410A.

You can find the refrigerant type on a label attached to your outdoor unit. Look for a sticker or plate on the side or back of the condenser—it will list the model number, serial number, and refrigerant type. If you cannot locate it or the label is faded, a technician can tell you in seconds by checking the unit's documentation or the system itself.

The type of refrigerant does not affect how your heat pump works from your perspective. All modern refrigerants do the same job: absorb heat from outside air (even in cold weather) and move it indoors, or reverse the process to cool your home. The difference is mainly environmental and cost-related.

Refrigerant leaks are the main reason you will hear about your heat pump's refrigerant

A healthy heat pump system is sealed and does not lose refrigerant over time. However, vibration, corrosion, or physical damage can create small holes in the copper tubing, allowing refrigerant to escape. When this happens, your heat pump loses its ability to transfer heat efficiently.

Signs of a refrigerant leak include reduced heating or cooling output (your home does not reach the temperature you set), ice buildup on the outdoor unit in winter, or hissing sounds coming from the unit. If you notice any of these, turn off the heat pump and call a technician. Running a leaking system can damage the compressor, the most expensive part to replace.

A technician will use a leak detector to find the hole, repair it (usually by soldering the copper line), and then refill the system with the correct refrigerant. The cost varies widely depending on the size of the leak and the type of refrigerant needed. R-22 refills are more expensive because supplies are limited and technicians must use reclaimed (recycled) refrigerant rather than new stock.

R-22 phaseout and what it means for older heat pumps

The EPA stopped allowing manufacturers to produce new R-22 refrigerant on January 1, 2020. This was part of an international agreement to protect the ozone layer—R-22 releases chlorine when it breaks down in the atmosphere, which damages ozone. The phaseout does not mean R-22 heat pumps stop working; it means servicing them becomes more expensive and complicated.

If your heat pump uses R-22 and develops a leak, a technician can still repair it, but they must use reclaimed R-22 from old systems that have been decommissioned. Reclaimed refrigerant costs significantly more than new R-410A or R-32. Additionally, some technicians may charge a premium for handling R-22 because of the extra steps required to manage it responsibly.

If your R-22 system needs major repairs (like a compressor replacement), you may face a choice: spend money to repair it with reclaimed refrigerant, or replace the entire unit with a modern system that uses a newer refrigerant. A technician can help you weigh the costs. Many homeowners find that replacing a 15+ year old R-22 system makes financial sense because newer units are more efficient and have lower operating costs.

What happens to refrigerant when your heat pump reaches the end of its life

When you replace an old heat pump, the technician must safely remove and dispose of the refrigerant before dismantling the unit. This process is called recovery. The technician uses a recovery machine to pull all the refrigerant out of the system, stores it in a tank, and then sends it to a facility that either recycles it or disposes of it according to EPA rules.

You do not need to do anything—the technician handles the entire process as part of the removal service. However, it is worth knowing that responsible refrigerant recovery is required by law, and reputable HVAC companies will never straightforward vent refrigerant into the air. If a technician suggests they will, find a different company.

Newer refrigerants and what makes them different

R-410A became the standard replacement for R-22 starting around 2010. It does not damage the ozone layer, but it still contributes to global warming. Newer refrigerants like R-32 and R-454B were developed to be more efficient and have lower global warming potential. Some manufacturers are also experimenting with hydrofluoroolefin (HFO) blends, which have even less environmental impact.

From a homeowner's perspective, the main difference is efficiency. Heat pumps using R-32 or R-454B typically achieve higher seasonal efficiency ratings (SEER2 and HSPF2) than older R-410A units, which means lower energy bills. However, these newer refrigerants are still relatively new to the market, so repair parts and technician familiarity may vary by region.

If you are considering a new heat pump, ask the installer which refrigerant the unit uses and what the efficiency ratings are. Do not choose based on refrigerant type alone—focus on the overall efficiency rating and how well the system matches your home's heating and cooling needs.

Frequently Asked Questions

Can I add freon to my heat pump myself?

No. Refrigerant handling requires EPA certification, specialized equipment, and knowledge of your specific system. Adding the wrong amount or type of refrigerant can damage the compressor and void your warranty. Always hire a licensed technician.

How often does a heat pump need refrigerant refilled?

A properly sealed heat pump should never need refrigerant refilled during normal operation. If a technician tells you the system needs regular "top-ups," it likely has a leak that should be found and repaired instead.

Is R-410A being phased out like R-22?

The EPA has not set a hard phaseout date for R-410A, but it is being gradually replaced by lower-impact alternatives like R-32 and R-454B. R-410A will remain available for many years, so systems using it are not at when ready risk of becoming unserviceable.

What should I do if my heat pump is leaking refrigerant?

Turn off the system and call a technician. Do not run the heat pump while it is leaking—this can damage the compressor. The technician will locate the leak, repair it, and refill the refrigerant.

Does the type of refrigerant affect my heating or cooling bills?

Indirectly, yes. Newer refrigerants like R-32 allow heat pumps to be more efficient, which can lower your bills. However, the efficiency of the entire system (compressor, fan, insulation, installation quality) matters more than the refrigerant type alone.