Why Your AC Is Freezing Up (And How to Stop It Without Calling Anyone)
It's 100 degrees outside, but your AC is blowing warm air. You go to check the indoor unit, and to your surprise, there's a block of ice wrapped around the copper lines. A frozen AC in the middle of summer seems like a paradox, but it's actually one of the most common cooling issues we see in Orange County.
Why Does It Freeze?
Your AC doesn't 'create' cold air. It removes heat from the air inside your home using a chemical called refrigerant. The refrigerant runs through the evaporator coil (the indoor part of your system). If there isn't enough warm air blowing over that coil, or if there isn't enough refrigerant to absorb the heat, the coil gets too cold. The moisture in the air condenses on the freezing coil and turns into ice.
3 Things to Check Before You Call Us
1. The Air Filter
A clogged air filter restricts airflow over the coil. This is the #1 cause of frozen ACs. Turn the system off, pull the filter out, and hold it up to a light. If you can't see light through it, it's blocking air. Replace it.
2. Closed or Blocked Vents
Closing vents in unused rooms might seem like a good way to save energy, but it actually chokes the system. Your AC was sized to push air through the entire house. Open all vents and ensure furniture isn't blocking return grilles.
3. Dirty Evaporator Coils
If your filter has been dirty for a while, dust has likely bypassed it and caked onto the coil itself. A dirty coil can't absorb heat properly. While you can clean a lightly dusty coil yourself with a soft brush, a heavily impacted coil usually requires a professional cleaning.
When to Call a Pro
If the filter is clean and the vents are open, you likely have a refrigerant leak or a failing blower motor. Don't just chip the ice off and turn it back on—you'll burn out the compressor, turning a $200 repair into a $3,000 replacement. Turn the system to 'Fan Only' to melt the ice, and give us a call.
