Discovering a block of ice on your air conditioner, especially in the middle of summer, is never a welcome surprise. However, a frozen AC unit is an extremely common cooling system complaint HVAC companies receive. The good news is that the causes are well understood, and most of them are preventable.
Restricted Airflow Is the Most Common Culprit
An air conditioner relies on a constant flow of warm air moving across its evaporator coil to function properly. When that airflow is blocked or reduced, the coil gets too cold, and moisture in the surrounding air freezes on contact. A clogged air filter is most likely the cause of this problem. Filters that haven’t been changed often enough significantly restrict airflow. Blocked vents, closed registers and dirty coils can all produce the same result.
Low Refrigerant Levels
Refrigerant is the substance that allows your AC system to absorb heat and cool your home’s air. When levels are low due to a leak, the pressure inside the system also drops. Lower pressure causes the evaporator coil to get colder than it should, making it freeze. Unlike a dirty filter, low refrigerant is not something you can take care of yourself. It requires a licensed technician to find the leak, fix it and recharge your system to the correct level.
Running the System in Cool Conditions Makes It Worse
Air conditioners are designed to run within a specific outdoor temperature range. Running the unit when temperatures drop below that range, typically around 60 degrees F, can cause freezing because the refrigerant cycle doesn’t function as it should. This situation can be easily avoided by turning the AC off when outside temperatures fall.
What You Should Do If Ice Forms on Your Unit
If you see ice, immediately turn off the AC and let it thaw completely. Running a frozen AC risks damaging the compressor, which is an extremely expensive part to replace. While it’s thawing, check the air filter. If it’s dirty, replace it. Once the unit is fully thawed, turn it back on and monitor it closely. If it freezes again, that points to a deeper issue that needs immediate attention from an HVAC professional.
Prevention Is Easy With Consistent Maintenance
There are a few easy tasks you can perform to prevent most freeze-related issues. Every one to three months, change the air filter. Keep vents and registers open throughout the home and schedule annual professional inspections. It’s also important to make sure that there is no debris around the outdoor unit.
A frozen AC unit is frustrating and inconvenient. Understanding what causes the problem makes it easier to avoid the kind of damage that turns a simple fix into a significant repair bill. If the issue keeps happening, a qualified HVAC technician can pinpoint the cause and get your AC running the way it should. When you need AC repair services in Newnan, GA, contact E Dennis AC Inc.
