Why Your AC Freezes Up (and What to Check First)
Ice on your indoor coil or outdoor lines almost always traces back to restricted airflow, and knowing what to check yourself can save an unnecessary service call.
The Airflow Problem Behind Most Frozen Coils
Your evaporator coil needs a steady flow of warm air moving across it to stay above freezing while it absorbs heat. Anything that restricts that airflow, a dirty filter, closed or blocked supply vents, a failing blower motor, or furniture pushed against a return vent, drops the coil temperature until moisture in the air starts freezing on it instead of draining off. Once ice builds up, it blocks airflow even further, which makes the problem worse in a loop.
What to Check Before Calling Anyone
Turn the system off completely and let it thaw for a few hours, running it while frozen can damage the compressor. While it thaws, check your filter first, since that's the cause more often than anything else. Walk the house and make sure supply vents aren't closed or blocked by rugs and furniture, and check that your return air grille isn't obstructed. Once it's thawed and the filter is clean, turn it back on and see if it freezes again within a day.
When It's Refrigerant, Not Airflow
If you've replaced the filter, cleared the vents, and it still freezes up, the cause is likely low refrigerant from a leak, and that's not a homeowner fix. Low refrigerant drops the coil pressure and temperature below what airflow issues alone would cause, and running the system low on refrigerant for long stretches damages the compressor, which is the most expensive part to replace. If it refreezes after a clean thaw and clear airflow, call a licensed HVAC pro rather than repeating the thaw-and-restart cycle.
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