AC Refrigerant Leak
An AC doesn't use up refrigerant; if it's low, it's leaking. Signs include weak cooling, ice on the refrigerant lines and a hissing sound. Leak repair plus recharge typically costs $200–$1,600 (about $800 on average), and a small 1–3 lb R-410A recharge alone $200–$600.
Last reviewed September 2026
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Is there ice on the copper lines?
Check the larger copper line at the outdoor unit and near the indoor coil. Frost or ice with a clean filter points to low refrigerant.
Signs it's this problem
- AC runs a long time but the house stays warm
- Ice or frost on the copper lines or indoor coil
- Hissing or bubbling sounds near the unit
- Higher electric bills than usual for the season
Why it happens
Refrigerant circulates in a sealed loop. Vibration, corrosion and worn joints create small leaks, especially in the indoor coil. As the charge drops, the coil gets too cold and ices over, and cooling capacity falls.
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Safety: Refrigerant can cause frostbite and shouldn't be handled without certification. Don't use DIY recharge cans on home AC systems.
AC Refrigerant Leak cost
| Job | Typical cost |
|---|---|
| Leak repair and recharge (average about $800) | $200–$1,600 |
| R-410A recharge, 1–3 lb | $200–$600 |
| Leak detection | $150–$400 |
| R-410A refrigerant, per pound | $50–$80/lb |
Got a quote? Check if it's fair
Typical professional price for this job: $200–$1,600
Common questions
Does an AC need regular refrigerant refills?
No. Refrigerant isn't consumed. If a system needs more, it has a leak that should be found and repaired.
Why has refrigerant become more expensive?
R-410A is being phased down under federal rules, which has pushed prices up. Newer systems use replacement refrigerants such as R-454B and R-32.