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AC Freezing Up
in Frisco, TX
Ice building up on your AC unit looks strange, but it means the system is not getting the airflow or refrigerant pressure it needs to work right. In Frisco, this tends to happen at the start of summer when a system that sat unused all winter gets pushed hard on the first hot week. Left alone, the ice can back up into the air handler and water can damage ceilings and walls.
Quick Answer
A frozen AC usually means airflow is blocked or refrigerant is low, and in Frisco the problem shows up most on systems that have dirty filters going into a 100-degree stretch. You need to shut the system off and let it thaw before a technician can properly diagnose it. Call (254) 279-4716 to get someone out before the ice damages the compressor.
Telltale Signs
Warning Signs to Watch For
- Ice visible on the copper refrigerant lines running to the outdoor unit
- The indoor unit is dripping water or the drain pan is overflowing
- Airflow from the vents drops to almost nothing
- The system shuts off on its own and will not restart
- Water stains appearing on the ceiling near the air handler
Root Causes
What Causes AC Freezing Up?
Blocked or Dirty Air Filter
When a filter gets clogged, warm air from your home cannot reach the evaporator coil in enough volume. The coil gets too cold with no warm air to absorb, and moisture in the air freezes on it. In Frisco, construction dust from the constant building going on around Panther Creek and Westside Frisco loads up filters faster than most homeowners expect.
The Fix
Filter Replacement and Airflow Check
Replacing the filter is the first step, but a technician should also check for other blockages in the duct system. Filters in Frisco homes during active construction nearby should be checked every 30 days.
Low Refrigerant from a Leak
When refrigerant is low, the pressure inside the evaporator coil drops below normal. At that low pressure, the coil surface gets much colder than it should, and moisture in the air freezes solid on it. This is a slow problem that gets worse every summer, especially on systems that are 10 or more years old.
The Fix
Refrigerant Leak Repair and Recharge
The technician finds and seals the leak, then brings the refrigerant back to the correct charge level. The system has to be fully thawed first before an accurate refrigerant measurement can be taken.
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 | Blocked or Dirty Air Filter | Low Refrigerant from a Leak |
|---|---|---|
| Weak airflow from all vents before freezing started | ||
| Filter is visibly grey and packed with debris | ||
| Ice forms even with good airflow and a clean filter | ||
| Water dripping from the indoor unit into the drain pan | ||
| System worked fine last summer but froze up this year |
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