If your air conditioner still runs on R22 refrigerant, you may be facing rising costs and dwindling availability. As of 2020, R22 has been phased out in the U.S., meaning no new supply is being produced — only recycled or reclaimed stock remains.
This has driven the price up to $200–$600 per pound, with a full recharge potentially costing $1,500 or more.
So, what’s your best move? If your AC is over 10 years old, a full system replacement may be the most cost-effective long-term option. If your unit is still in good shape, you can explore drop-in refrigerant replacements like MO99 or R410A.
In this guide, we’ll explain your options, their costs, and how to make the best choice for your home.
Using R22 Today: What to Expect
If your AC still runs on R22, you can keep using it — until you need a refrigerant recharge. When that happens, expect to pay $200–$600 per pound, with a full refill costing $1,500 or more due to R22’s limited supply. Some HVAC companies don’t even offer R22 refills anymore.
A temporary solution is switching to a drop-in refrigerant like MO99. While it avoids the high cost of R22, it can reduce cooling efficiency and may not be a long-term fix for older units.
Retrofitting With MO99: The Best R22 Replacement
MO99 (Freon™ MO99) is the best alternative to R22 for homeowners who want to keep their current AC. It costs 30–40% less than R22 and doesn’t require expensive system modifications.
Unlike other replacements, MO99 can be added without changing the compressor, refrigerant lines, or oil type — saving on labor costs. If your AC was built for R22, there’s a good chance MO99 will work as a direct replacement.
For safety reasons, refrigerants should never mix with other refrigerants or gases, including R22. Even if you’re having your air conditioner recharged with a retrofit solution like MO99, a technician will still need to completely drain the old refrigerant first.
Other R22 Replacement Options
If your AC isn’t compatible with MO99, you still have options — but most require system modifications. Ask your HVAC technician about these alternatives:
- R410A: Used in most modern AC systems, but requires a full system replacement due to different pressure levels.
- R134A: A lower-pressure refrigerant that’s easy to install but may not cool as efficiently in hot climates.
- R407C: A retrofit-friendly option that works with existing R22 coils but may require new expansion valves.
- RS-44b: The best direct replacement for R22, requiring no component changes and offering similar performance.
Keep in mind that some alternatives can cause moisture buildup, leading to acid formation inside refrigerant lines. Over time, this can corrode your system and shorten its lifespan. Your HVAC technician should test for compatibility before switching refrigerants.
When Does It Make Sense to Replace Your AC?
If your air conditioner still uses R22, it’s likely at least 12–15 years old — nearing the end of its lifespan. While retrofitting with MO99 or RS-44b can extend its life, a full replacement is often the smarter financial choice:
- Cost of keeping an R22 system: Expect to pay $1,500+ per refrigerant recharge, plus rising repair costs as parts become scarce.
- Cost of a new AC: A modern R410A system costs $4,000–$8,000, but it’s more efficient, cutting cooling costs by 20–40%.
Benefits of replacing your AC:
✅ No more dealing with R22 shortages and high costs
✅ Lower energy bills thanks to better efficiency
✅ Fewer breakdowns and costly repairs
✅ Increased home value and better resale appeal
If your AC is over 15 years old, replacing it is almost always the best option. Even if it’s 10–15 years old, weigh the repair costs against the long-term savings of a newer system.
How to Safely Dispose of Leftover R22
R22 is a controlled substance, meaning it’s illegal to release it into the air or throw it away because it contributes to ozone depletion and climate change. If you’re replacing your AC or switching refrigerants, a licensed HVAC technician must properly recover and dispose of R22.
Most HVAC companies include refrigerant removal when installing a new system or retrofitting with an alternative. If you’re only having refrigerant removed (without a replacement), expect to pay $100–$300 for professional recovery.
