A refrigerant leak can develop gradually, so homeowners may not immediately realize that their air conditioner has a problem.

Here are seven signs worth knowing.

1. Weak Cooling

The AC runs but does not cool the home as effectively as before.

2. Long Operating Cycles

The system may run continuously or for much longer than normal while struggling to reach the thermostat setting.

3. Ice on the Coil

Ice or frost on the indoor coil or refrigerant line can occur when refrigerant pressure is too low.

4. Unusual Sounds

Hissing or bubbling sounds near refrigerant components may indicate escaping refrigerant, although other problems can create unusual noises too.

5. Higher Energy Consumption

A struggling system may operate longer and consume more electricity.

6. Uneven Cooling

Some rooms may remain warmer than others because the system is no longer operating correctly.

7. Repeated Refrigerant Top-Ups

If an AC repeatedly needs refrigerant, there may be a leak that has not been repaired.

A refrigerant leak should not simply be treated by repeatedly adding more refrigerant. The source needs to be identified and addressed.

Qualified HVAC technicians have specialized tools for leak detection and can determine whether a component can be repaired or should be replaced.

Recognizing the warning signs early can help prevent additional stress on the air conditioning system.