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At first glance, seeing ice on your air conditioner might seem like a sign that it’s working extra hard to cool your home. However, a frozen evaporator coil is actually a red flag that something is seriously wrong with your AC system. If ignored, this issue can lead to costly repairs or even a complete system breakdown. As your trusted HVAC experts, Edelman is here to explain why AC coils freeze, what causes this issue, and when you need professional AC repair in Champaign, IL.
What Causes an AC Coil to Freeze?
The evaporator coil in your air conditioner is responsible for absorbing heat from your home’s air. When everything is working properly, warm air moves over the coils, refrigerant absorbs the heat, and the cooled air is pushed back into your home. But when something disrupts this process, the temperature of the coil can drop too low, leading to ice buildup. Here are some of the most common reasons this happens:
Restricted Airflow
Your AC system needs proper airflow to function correctly. When airflow is restricted, the evaporator coil doesn’t receive enough warm air to maintain its temperature, causing it to freeze. Several issues can contribute to restricted airflow, including:
- Dirty air filters – Clogged filters prevent sufficient air from passing through your system.
- Blocked or closed vents – If too many vents are closed or obstructed, airflow is reduced.
- Blower motor problems – A malfunctioning blower fan can’t push enough air across the evaporator coil.
- Ductwork issues – Leaks or blockages in your duct system can limit airflow.
Low Refrigerant Levels
Refrigerant plays a crucial role in cooling your home. If your system is low on refrigerant due to a leak, the pressure in the system drops. This leads to a lower temperature in the evaporator coil, increasing the risk of freezing. If you suspect a refrigerant leak, it’s essential to call a professional immediately, as handling refrigerant requires special training and certification.
Dirty or Clogged Evaporator Coil
Over time, dirt, dust, and debris can build up on your evaporator coil. A dirty coil can’t absorb heat efficiently, which can cause temperatures to drop too low and lead to ice formation. Regular maintenance and coil cleaning can prevent this issue from developing.
Thermostat or System Malfunctions
A faulty thermostat or electrical issue can cause your AC to run longer than it should. If your system isn’t cycling off properly, the coil may become too cold, leading to freezing. Faulty sensors or wiring issues may also cause irregular operation that results in a frozen coil.
Signs You Have a Frozen AC Coil
If your AC coil has frozen, you may notice some warning signs, including:
- Warm air blowing from your vents
- Visible ice buildup on the indoor unit
- Increased humidity levels in your home
- Water leaks around your AC unit (as the ice melts)
- Unusual noises from your air handler
If you experience any of these symptoms, it’s important to act quickly before the problem worsens. A frozen coil is often a symptom of a bigger issue that requires professional attention. If you’re dealing with a frozen AC coil, don’t wait until the problem leads to a full system failure. Edelman’s HVAC professionals are here to diagnose and fix the issue quickly, keeping your home cool and comfortable all season long. Contact us today to schedule service and get your AC running at its best!
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