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Wondering Why Your AC Coils are Frozen?
Frozen air conditioning coils happen when your AC's evaporator coil drops below freezing, usually due to restricted airflow or low refrigerant, and forms a layer of ice that blocks proper cooling. The ice insulates the coil and stops the heat transfer process your AC depends on.
What Causes an AC Coil to Freeze?
AC coils freeze for a variety of reasons. The most common, though, is a lack of airflow. Dirty air filters or problems with your ductwork can cause weak airflow, which hinders your equipment's ability to keep coils warm and running properly. Temperatures drop, and the AC coils freeze.
Refrigerant leaks and a wide variety of mechanical issues can also result in frozen coils. The cooling process, for example, creates condensation that can pool on the coils and freeze if it isn't drained properly. The ice insulates the coil and interrupts the heat transfer process.
Signs of a Frozen AC Coil
Regardless of how AC coils freeze, the end result is usually the same: your AC system can't effectively cool your home, and you'll likely see your utility bill climb as the system struggles to keep up.
Unsure if you have a frozen coil? Watch for these signs:
AC unit runs but doesn’t emit cold air
Ice is visible on the indoor or outdoor coils
Visible extra moisture/condensation around your AC system or home
Troubleshooting Frozen AC Coils
If you suspect you have a frozen coil, start with a few simple troubleshooting techniques:
1. Ensure the air filter is new and clean. A clogged air filter restricts airflow, causing the coil to freeze.
2. Turn off the thermostat and turn the fan on. This pushes air over the indoor coil, which can help it thaw. Check back in several hours.
3. If your system has a heat pump, turn on defrost mode. Your AC unit may also have specific de-icing instructions.
How Do I Fix a Frozen AC Coil?
If you've followed these DIY steps and still aren't feeling cool air, it's time to call Choate's HVAC. During your free inspection, we'll assess your system and recommend the right repair, whether that's a professional coil cleaning, correcting a refrigerant leak, repairing ductwork, or clearing a clogged drain pan and line. We'll get to the bottom of your coil freezing fast and get your space cool and comfortable again.
If your AC isn't emitting cool air, or you'd rather catch coil freezing before it happens, our FAM Plan covers seasonal tune-ups that catch airflow and refrigerant issues early. Get in touch today to schedule a consultation.
FAQs
What causes AC coils to freeze?
The most common cause is restricted airflow from dirty air filters or duct problems, which drops coil temperature below freezing. Refrigerant leaks and drainage issues that let condensation pool on the coil can also cause freezing.
What are the signs of a frozen AC coil?
Watch for an AC unit that runs but blows warm air, visible ice on indoor or outdoor coils, and extra moisture or condensation pooling around the system or nearby walls and flooring.
How do I troubleshoot a frozen AC coil?
Check that the air filter is clean, then turn off the thermostat and run the fan only for several hours to help the coil thaw. If your system has a heat pump, switch it to defrost mode.
How do I fix a frozen AC coil?
If DIY steps don't clear the ice, a technician needs to inspect the system, since the cause could be a dirty coil, a refrigerant leak, blocked ductwork, or a clogged drain pan and line.
Should I run my AC while the coil is frozen?
No. Running the system with a frozen coil can strain the compressor and cause expensive damage. Turn the thermostat off and let the fan run to help the coil thaw before restarting cooling.
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