Key Takeaways
- Refrigerant does not get used up. If your AC is low on refrigerant, it has a leak. Adding refrigerant without finding and fixing the leak is a temporary fix that leaves the root problem in place.
- Five signs homeowners can identify at home: running but not cooling, ice on the lines or coil, hissing or bubbling sounds, longer-than-normal run cycles, and higher-than-normal energy bills in summer.
- You cannot add refrigerant yourself. Federal law under EPA Section 608 requires certification to purchase and handle refrigerants. This is never a DIY repair.
- Running an AC low on refrigerant damages the compressor. Compressor replacement costs $1,200 to $2,800. A refrigerant check and repair costs a fraction of that. Catching it in April is the right move.
- Shoemaker provides refrigerant checks and leak repair across Chester County. Call (610) 671-3595 before cooling season.
Shoemaker Heating and Cooling serves Chester County from Honey Brook, PA. Call (610) 671-3595 or visit shoemaker-hvac.com to schedule a refrigerant check before summer.
Low refrigerant is one of the most common causes of a central AC that runs but does not cool the house effectively. It is also one of the most misunderstood. Many Chester County homeowners assume refrigerant is like fuel and gradually gets used up over the season. It is not. Refrigerant cycles continuously through a closed system. If the level drops, something has created a path for it to escape.
Here are the five signs to look for, what each one means, and what to do when you find them.
5 Signs Your AC Is Low on Refrigerant
- The system runs but the air is not cold enough. Set your thermostat 5 degrees below the current room temperature and let the system run for 15 minutes. Air from the registers should feel noticeably cold. If it feels only slightly cool, or if the temperature in the house barely drops despite the AC running continuously, low refrigerant charge is one of the first things to check. A system short on refrigerant cannot absorb enough heat from indoor air to deliver effective cooling.
- Ice forms on the copper refrigerant lines or evaporator coil. Look at the copper tubing running from the outdoor condenser unit into the house. Also check around the air handler. Ice forming on either is a clear sign something is wrong with the refrigerant cycle. Low refrigerant causes the pressure inside the evaporator coil to drop below normal, which causes moisture in the air to freeze on the coil surface rather than draining away as intended. If you see ice, shut the system off and call a technician. Running an iced-over system causes compressor damage.
- You hear a hissing or bubbling sound near the indoor or outdoor unit. A refrigerant leak often produces an audible sound. Hissing indicates refrigerant escaping as a gas. Bubbling or gurgling indicates refrigerant moving through the leak point as a liquid. These sounds are typically faint and may require standing close to the unit to hear. If you detect either near the indoor air handler or the outdoor condenser, schedule a leak check immediately.
- The outdoor unit runs almost constantly without the house cooling down. A properly charged system reaches the thermostat setpoint and cycles off. A system low on refrigerant runs longer and longer cycles because it can never quite reach setpoint. If your outdoor unit is running nearly continuously on a warm day and the house is still not comfortable, low refrigerant charge is a likely cause alongside dirty coils or airflow problems. A technician can distinguish between these in a single diagnostic visit.
- Your energy bills spike in summer without a change in usage habits. A low-charge AC system compensates by running longer. Longer run time means more electricity consumed for the same or worse cooling performance. If last July’s bills looked normal and this year’s are significantly higher, the efficiency of the system has likely degraded. Low refrigerant is one of several causes worth checking.
Important: If you observe ice on the unit, shut the system off immediately and let it thaw before calling a technician. Running a system with a frozen coil causes compressor damage. Never attempt to chip ice off the coil.
What Causes Low Refrigerant in a Chester County AC System
The most common causes of refrigerant loss in Chester County residential AC systems:
- Pinhole leaks in the evaporator coil. Over time, formic acid produced by a reaction between refrigerant and organic compounds in indoor air can corrode small pinholes in copper evaporator coils. This is the most common source of slow refrigerant loss in systems over 8 years old.
- Loose or degraded Schrader valve cores. These are the service ports used to check refrigerant pressure. The valve cores can lose their seal over years of thermal cycling.
- Fitting and connection leaks. Vibration from normal operation can loosen flare fittings over time, particularly on older systems.
- Improper original charge. Systems that were never correctly charged at installation lose cooling performance from day one. This is less common with reputable installers but does occur.
Why You Cannot Add Refrigerant Yourself
Federal law under EPA Section 608 of the Clean Air Act requires certification to purchase and handle refrigerants used in air conditioning systems. Attempting to add refrigerant without EPA 608 certification is illegal, regardless of where the refrigerant is purchased. Beyond the legal issue, adding refrigerant without first identifying and repairing the leak simply delays the same problem.
A certified technician checks the system pressure, identifies the leak point using electronic leak detectors or UV dye, repairs the leak, and recharges the system to the manufacturer-specified pressure. This is the complete repair, not a temporary top-off.
Suspect low refrigerant in your Chester County home?
Shoemaker provides refrigerant checks and leak repair across Honey Brook, Downingtown, Elverson, Morgantown, and all of Chester County.
Call (610) 671-3595
Or
book at shoemaker-hvac.com
Frequently Asked Questions AC Refrigerant in Chester County, PA
No. Federal law under Section 608 of the Clean Air Act requires EPA 608 certification to purchase and handle refrigerants used in AC systems. Attempting to add refrigerant without certification is illegal and can damage your system. Call Shoemaker at (610) 671-3595 for a certified refrigerant check.
Refrigerant recharge costs vary based on refrigerant type and the amount needed. R-410A systems typically run $150 to $400 for a recharge depending on how much refrigerant is needed. Older R-22 systems cost significantly more due to refrigerant scarcity since the EPA phased out R-22 production in 2020. Shoemaker provides a written estimate before any work begins. Call (610) 671-3595.
Yes. Refrigerant does not get consumed or evaporate during normal operation. If your system is low, something has created a path for refrigerant to escape. Adding refrigerant without finding and fixing the leak is a temporary fix. Shoemaker locates and repairs the leak before recharging so the repair is complete, not just postponed.
Running an AC low on refrigerant causes the compressor to operate under abnormal pressure and temperature conditions. Over time this causes overheating and premature compressor failure. Compressor replacement costs $1,200 to $2,800, and in many cases makes replacement of the entire system more financially sensible. A refrigerant check, leak repair, and recharge costs a fraction of that. Call Shoemaker at (610) 671-3595.