Why is there warm air coming from my air conditioning vents?

You should be able to tell when it fails. There are several symptoms of a failed evaporator coil that may be noticeable to any homeowner, including:

1. Warm air blowing from the vents: One of the most common symptoms of a failed evaporator coil is warm air coming out of the vents. This is because the coil is responsible for absorbing heat from the air, and if it's not functioning properly, it won't be able to cool the air as it passes over it.
2. Reduced airflow: If you notice that the airflow from your air conditioning system has decreased, it could be a sign of a failing evaporator coil. This is because the coil can become clogged with dirt and debris over time, which restricts the flow of air through the system.
3. Higher energy bills: A failing evaporator coil can also cause your energy bills to increase, as your air conditioning system will have to work harder to cool your home. This is because the system will need to run for longer periods of time to achieve the desired temperature, which will result in higher energy usage.
4. Moisture or water around the unit: If you notice moisture or water around your air conditioning unit, it could be a sign that the evaporator coil is leaking. This can occur if the coil becomes corroded or develops a hole, allowing refrigerant to escape.
5. Hissing or bubbling noises: If you hear hissing or bubbling noises coming from your air conditioning unit, it could be a sign of a refrigerant leak caused by a failed evaporator coil.

If you suspect that your air conditioning system's evaporator coil has failed, it's important to have it inspected and repaired by a qualified HVAC technician as soon as possible to prevent further damage to the system.