It may seem strange for an air conditioner to freeze up in the middle of summer, but it is actually a common HVAC problem. When ice forms on the indoor coil or refrigerant lines, your system may struggle to cool your home, run longer than normal, or stop working altogether.
An AC freeze-up is usually a sign that something is preventing the system from absorbing heat properly.
Poor Airflow Is a Common Cause
One of the most common reasons an AC freezes up is restricted airflow. Your system needs warm indoor air to move across the evaporator coil. If not enough air passes over the coil, the temperature can drop too low and moisture can begin to freeze.
Airflow problems may be caused by a dirty air filter, blocked vents, closed registers, a dirty evaporator coil, or issues with the blower motor. Even something as simple as forgetting to change the filter can put extra strain on the system during peak cooling season.
Low Refrigerant Can Also Lead to Ice
Another possible cause is low refrigerant. Refrigerant is what allows your AC to absorb heat from inside the home and move it outside. If the refrigerant level is too low, often because of a leak, pressure inside the system can drop and cause the coil to become too cold.
This is not something homeowners should try to fix themselves. Adding refrigerant without addressing the source of the issue will not solve the problem long term.
What to Do if You See Ice
If you notice ice on your AC, turn the system off and let it thaw. Running the unit while it is frozen can make the problem worse and may damage the compressor.
You can also check your air filter and make sure vents are open and not blocked by furniture, rugs, or curtains. However, if the system freezes again after thawing, it is time to have it inspected.
When to Call an HVAC Professional
An AC that freezes up more than once should not be ignored. The issue may be tied to airflow, refrigerant, coil condition, electrical components, or another mechanical problem.
HRD Air can inspect your system, identify what is causing the freeze-up, and recommend the right repair before a small issue turns into a bigger breakdown during the hottest part of the year. Contact our team of AC professionals today.