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💧 Frozen AC Repair, Georgetown TX

Ice on your indoor unit or refrigerant lines is a symptom, not the problem itself. ProAir Georgetown repairs the root cause, not just the ice. Defrosting without fixing the underlying issue means your system will freeze again, typically within 24 hours of restart.

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What Causes AC Freeze-Up in Georgetown

Evaporator coil ice forms when the refrigerant temperature drops below the freezing point of moisture in the air passing over the coil. This happens when either airflow drops below the coil's design threshold or refrigerant pressure drops below the design operating range, or both.

Low Refrigerant, Primary Cause in Older Georgetown Systems

When refrigerant charge drops, suction pressure and evaporator temperature drop with it. The coil gets colder than its design temperature and moisture from Georgetown's humid air freezes on contact. Systems in Serenada's 1980s-1990s homes with original or aging equipment are the most common freeze-up calls we receive.

Restricted Airflow, Filter, Blower, or Duct Issue

When not enough warm air passes over the coil, the coil stays too cold and freezes. Georgetown's heavy construction particulate load and high cedar pollen season (December-February) accelerate filter loading. We also see freeze-ups in homes that switched to high-MERV filters without verifying their air handler can pull adequate airflow through the denser media.

Running at Night with Low Setpoints

Georgetown homeowners who set thermostats to 68°F or below overnight on humid summer nights are asking their systems to remove more moisture than designed. Systems that are marginally charged or have dirty coils may freeze under these conditions even though they perform adequately during the day.

The Right Way to Handle a Frozen AC

Before we arrive: turn the system to FAN ONLY (not off, not cooling) to begin defrosting. Don't turn the system completely off, the fan helps melt ice faster. Don't run it in cooling mode, it will refreeze immediately. Once we arrive, we defrost completely before diagnosing, accurate refrigerant measurements require a fully defrosted coil. Then we identify and repair the root cause.

⚠️ What Not to Do With a Frozen AC

  • Don't pour hot water on the coil, thermal shock can damage the coil
  • Don't try to scrape ice off, coil fins are easily bent and damaged
  • Don't restart in cooling mode until fully defrosted
  • Don't assume defrost = fixed, it will refreeze without root cause repair

Frequently Asked Questions, Frozen AC Repair

My AC froze up, should I turn it off? +
Switch it to FAN ONLY, not off. The blower running without the compressor helps defrost the coil faster than turning everything off. Do not run it in cooling mode, the coil will refreeze.
How long does it take for a frozen AC to thaw? +
1-4 hours on FAN ONLY mode, depending on how thick the ice buildup is. A coil frozen solid for 24+ hours may take longer. Don't restart in cooling until all ice is gone, we can confirm with a temperature check.
Will my AC freeze up again after defrosting? +
Yes, within 24 hours if you don't repair the root cause. Defrost is not a repair, it's preparation for diagnosis. We identify and fix the underlying issue (refrigerant, coil, airflow) in the same visit when possible.
Is a frozen AC an emergency? +
Yes and no. A frozen system can't cool your home and water damage from ice melt is possible if the drain pan overflows. It's worth a same-day call. In Georgetown's summer heat, a frozen AC on a 104°F day genuinely qualifies as urgent.
Should I try adding refrigerant myself if I suspect that's the cause? +
No. Refrigerant handling requires EPA certification and the correct gauges to measure superheat and subcooling accurately. Adding refrigerant without confirming a leak and the correct target charge can overcharge the system, which causes its own set of problems and can damage the compressor.
Can a dirty air filter really cause my whole AC to freeze up? +
Yes, and it's one of the most common causes we find. A clogged filter restricts airflow across the evaporator coil enough that the coil temperature drops below freezing, and ice starts forming on the coil surface even though nothing else in the system has failed.

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