What Is Refrigerant and Why Does It Matter?
Refrigerant is the substance that makes air conditioning physically possible. It absorbs heat from indoor air and releases it outside, cycling continuously through the system. Understanding the basics helps homeowners make better decisions about repairs and replacements.
How Refrigerant Works
Refrigerant circulates between two coils: the evaporator coil (inside, cold) and the condenser coil (outside, hot). Inside, low-pressure refrigerant absorbs heat from your home's air and evaporates. It moves to the outdoor unit where the compressor pressurizes it, releasing the heat to the outdoor air. The refrigerant then expands back to low pressure and the cycle repeats.
Refrigerant does not get "used up" -- a properly sealed system keeps the same refrigerant indefinitely. Low refrigerant always means there is a leak somewhere in the system.
The Refrigerant Transition: R-22 to R-410A to R-454B
- R-22 (Freon): Used in systems manufactured before 2010. Production ended January 1, 2020. Recharging an R-22 system now costs $100-$175 per pound (vs. $15-$25 for modern refrigerants). Any R-22 leak on a system over 12 years old is almost always a replacement trigger -- both economically and environmentally.
- R-410A (Puron): Replaced R-22 and was the standard from roughly 2010-2025. Less environmentally damaging than R-22. New equipment using R-410A stopped being manufactured in the US after January 1, 2025 due to new EPA regulations.
- R-454B and R-32: The new generation of refrigerants with much lower global warming potential. Most new HVAC equipment sold after 2025 uses these. They require different oils and handling procedures than R-410A.
What This Means for Homeowners
If your system uses R-22 and has a refrigerant leak, the repair cost is high and the case for replacement is strong. If your system uses R-410A and is functioning well, there is no urgency to replace it -- contractors can still service R-410A systems and the refrigerant remains available. When buying a new system, confirm it uses R-454B or R-32 to ensure long-term parts availability.
Frequently Asked Questions
- Why is my AC low on refrigerant?
- Refrigerant does not deplete on its own. If your system is low on refrigerant, there is a leak somewhere in the system -- at the coil, access valve, line connection, or refrigerant line. A technician needs to find and repair the leak before recharging. Simply recharging without finding the leak is a temporary fix.
- What happens if refrigerant runs out completely?
- A system that runs out of refrigerant entirely will continue to run but produce no cooling. The compressor may overheat from running without proper lubrication (refrigerant carries compressor oil). Continued operation with no refrigerant can damage the compressor permanently.
- Is R-22 still available?
- R-22 production ended January 1, 2020, but existing stockpiles can still be sold. Supply is limited and prices have risen dramatically: $100-$175 per pound versus $15-$25 for R-410A. This is why any R-22 refrigerant leak on an older system is almost always a replacement trigger.
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