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AC Frozen or Iced Over
in Richardson, TX
When an AC unit freezes up in Richardson, it usually means something is blocking airflow or the refrigerant charge is off. The coil inside the air handler drops below freezing, and moisture in the humid Texas air turns to ice on contact. Once ice blocks the coil, no air moves through it at all, and the house gets warm even though the system is running.
Quick Answer
A frozen AC happens when airflow drops too low or refrigerant runs short, causing the coil to get so cold that moisture in the air freezes right onto it. Turn the system off and let it thaw completely before a technician checks it. Running a frozen unit can damage the compressor. Call (361) 202-9465 if it keeps freezing after you let it thaw.
Telltale Signs
Warning Signs to Watch For
- Ice visible on the copper refrigerant lines running to the outdoor unit
- The air handler is running but little to no air comes from the vents
- Water puddles around the indoor air handler as the ice melts
- The outdoor unit fan is spinning but the house won't cool
- A musty smell comes from the vents after the unit partially thaws and runs again
Root Causes
What Causes AC Frozen or Iced Over?
Clogged or Restricted Airflow
The evaporator coil needs a steady flow of warm indoor air passing over it to keep from getting too cold. A clogged filter, a closed vent, or a failing blower fan cuts that airflow, the coil temperature drops below freezing, and ice starts building up fast. Richardson's spring and fall bring a lot of pollen and fine dust through open windows, and that debris loads up a filter much faster than homeowners expect.
The Fix
Filter Replacement and Airflow Inspection
After a full thaw, the technician replaces the filter, checks that all vents are open, and tests the blower motor to make sure it's moving enough air. If the blower is weak or failing, replacing it is part of the fix.
Low Refrigerant Charge
When the refrigerant level drops due to a slow leak, the pressure in the evaporator coil falls below normal and the coil gets far colder than it's supposed to. Moisture in the air freezes on contact with the coil, and the ice builds up until airflow is completely blocked. Systems in homes built before 1995 in Richardson often have aging copper lines with small pinholes that lose refrigerant slowly over several years.
The Fix
Leak Repair and Refrigerant Recharge
The technician finds and repairs the leak, then restores the refrigerant to the manufacturer's specified charge. Recharging without fixing the leak just delays the next freeze-up.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Clogged or Restricted Airflow | Low Refrigerant Charge |
|---|---|---|
| No airflow from vents even though the system is running | ||
| Ice on the refrigerant line and filter was not changed in months | ||
| System freezes up repeatedly even with a fresh filter | ||
| Water dripping from the indoor unit after the system shuts off | ||
| House is warm and the outdoor unit feels like it's barely running |
Free Inspection
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