You walk past your indoor unit and notice ice forming on the coil or refrigerant lines. Your AC has been running for hours, but the house still feels warm. If your AC is freezing up, it can be confusing because the system often appears to be working when it is not performing properly.
At Galbreath Heating & Air, we help Richmond Hill homeowners diagnose and fix this issue before it turns into a full system breakdown. Here is what you need to know.
Common Reasons an AC Freezes Up
Understanding what caused the freeze is the first step toward fixing it and preventing it from coming back. The most frequent causes include:
- Dirty or clogged air filter: A clogged filter cuts airflow across the evaporator coil fast. Less warm air moving over the coil is often all it takes to trigger a freeze.
- Blocked or closed vents: Closing vents in unused rooms restricts airflow across the coil, just as a dirty filter does. Every vent in the house should stay fully open.
- Low refrigerant from a leak: When refrigerant levels drop, pressure inside the coil falls, and the coil temperature drops below freezing. This is not a DIY fix and requires a licensed technician.
- Dirty evaporator coil: Dust, pollen, and coastal grime coat the coil and act as insulation, pushing temperatures below freezing over time. This is especially common in Richmond Hill as spring approaches.
- Running the AC when outdoor temperatures are too low: Operating the unit when the outdoor temperature is below about 60 degrees can cause the coil to ice over, even when everything else is working correctly.
Steps to Take When Your AC Freezes
If you discover your AC is frozen, turn it off at the thermostat immediately. Running a frozen unit forces the compressor to work under stress it was not built for and can result in compressor failure, one of the most expensive repairs in HVAC. Once the unit is off, work through these steps:
Step 1: Switch the Fan to “On” Instead of “Auto”
Go to your thermostat and switch the fan setting from “auto” to “on.” This keeps air circulating over the frozen coil and speeds up thawing without running the full refrigeration cycle. Do not turn the cooling back on yet. The goal right now is airflow, not more cold.
Step 2: Replace the Air Filter
Pull the filter out and hold it up to a light source. If you cannot see light passing through it, it needs to go. A clogged filter is the most common cause of a frozen AC, and replacing it takes two minutes and costs a few dollars. Put the new filter in before you do anything else.
Step 3: Open Every Vent in the House
Walk through every room and make sure all supply and return vents are fully open and unobstructed. Furniture, rugs, and curtains blocking vents restrict airflow across the coil and can trigger or worsen a freeze. This includes rooms you rarely use. Closing vents to save energy is one of the most common mistakes that leads to this problem.
Step 4: Let the Ice Melt Completely
Do not rush this step. A full thaw typically takes two to four hours, depending on how much ice has built up. Place towels around the base of the air handler to catch drips as the ice melts. Do not chip or pry the ice off the coil. It feels like the faster option, but it can bend the coil fins, permanently restrict airflow, and turn a simple fix into an expensive repair.
Step 5: Turn the AC Back On and Monitor It
Once the coil is fully thawed, switch the fan back to “auto” and turn the cooling back on. Let it run for an hour and check whether the unit is cooling normally and holding temperature. If everything looks good, a dirty filter was likely the only issue.
When You Need to Call a Professional
If the unit refreezes after you replace the filter and clear the vents, the problem is not something you can resolve at home. At that point, the most likely causes are a refrigerant leak or a dirty evaporator coil, both of which require a licensed technician to address safely. Call for AC repair if you notice any of the following:
- The unit freezes again within a few hours of thawing
- Your AC is running, but not cooling the house after the ice has cleared
- You hear a hissing or bubbling sound near the indoor or outdoor unit
- You see ice forming on the refrigerant lines outside the unit
- Your energy bills have spiked without any change in how you use the AC
Do not keep running the unit while waiting for service. Each cycle puts additional strain on the compressor and can turn a refrigerant repair into a full compressor replacement.
Why Choose Galbreath Heating & Air
Richmond Hill homeowners have trusted Galbreath Heating & Air for decades, and that trust comes from the way we work, not just what we fix. When we diagnose a frozen AC, we identify the root cause rather than offer a surface-level patch. Here is what you can expect when you call us:
- Decades of local experience: We have been serving Richmond Hill and the surrounding Coastal Georgia area for over 40 years. We know exactly how the humidity, salt air, and heavy pollen seasons affect your equipment.
- Honest diagnosis: We explain what we find in plain terms and walk you through your options without pressure. You will always understand what is happening and why before any work begins.
- Long-term repairs: Every repair we complete is done with the care and attention that keeps you from calling us back for the same problem a month later.
- Licensed technicians: Our team is trained and certified to handle refrigerant, electrical components, and everything in between safely and correctly.
Schedule AC Repair Before the Heat Hits
A frozen AC in April is a warning you should not ignore. That same problem in the middle of a Coastal Georgia summer means a house that climbs to 85 degrees before a technician can reach you. Do not wait until a breakdown reveals your unit has a refrigerant leak or a coil that needs cleaning; find out months ago.
Call Galbreath Heating & Air at (912) 756-3102 or schedule AC repair or a pre-season tune-up online. Our team is ready to find the problem, fix it right, and make sure your home stays cool all summer long.
