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Why Is My Air Conditioner Freezing Up?
Seeing ice on your air conditioner can be alarming, especially when your system is supposed to be cooling your home. An AC can freeze up for several reasons, including restricted airflow, low refrigerant, or problems with the system's components. Here are some things you can check and what to do if the problem keeps coming back.
The 5 Real Causes
What's Actually Freezing Your AC
1
Dirty or Clogged Air Filter
The single most common cause. A clogged filter chokes off airflow across the coil, letting it get too cold and ice over. Check it first it's free to fix.
2
Low Refrigerant (a Leak)
Refrigerant doesn't get "used up" if the level is low, there's a leak. Low pressure drops the coil temperature well below freezing. This one needs a licensed tech.
3
Blocked or Closed Vents
Furniture over a return vent, or too many supply vents closed off, restricts the airflow the system needs to keep the coil at a safe temperature.
4
Dirty Evaporator Coil
A layer of dust and grime on the coil acts like insulation, disrupting the heat exchange and letting condensation freeze on the surface.
5
Failing Blower Motor or Fan
If the blower fan slows down or stops, warm air stops moving across the coil, and it freezes over from lack of airflow, even with a clean filter.
6
Running It Too Cold, Too Often
Setting the thermostat unusually low, or running AC in cooler outdoor temps, can push the coil below freezing even on an otherwise healthy system.
Do this before we arrive
​What to Do Right Now
Turn the system off completely
Switch off at the thermostat, and flip the breaker if you can. Don't just set it to "off" and walk away leave it fully powered down.
Let the ice melt on its own
This can take 2-6 hours. Don't chip or scrape the ice it can damage the coil fins and the copper lines underneath.
​Check (and replace) the filter
Pull it out and hold it up to a light. If you can't see light through it, that's likely your problem. Swap it if you have a spare.
Set fan to "On," not "Auto"
Running just the fan (with cooling off) helps air circulate and speeds up thawing without stressing the compressor.
Put down towels
Melting ice means water, sometimes a lot of it. Towels around the indoor unit protect your floors while it thaws.
Don't keep restarting it
Repeatedly switching it back on to "test it" while ice is present is the #1 way a simple freeze-up turns into a blown compressor.
Why homeowners call us first
Frozen AC Repair You Can Actually Get Today
Same-Day
Service
Call before end of day and we'll do everything we can to get a technician to you today.
After-Hours & Weekends
AC problems don't wait for business hours neither do we. Nights and weekends included.
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You'll know the cost before we start. No surprise fees for showing up after hours.
Licensed Local Technicians
Florida-licensed HVAC pros (CAC1821934) based right here in St. Petersburg.
Know when to stop DIY-ing it
Signs You Need a Professional, Not Just a Filter Swap
-
Ice keeps coming back within a day or two of thawing
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Hissing or bubbling sounds near the indoor or outdoor unit
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Warm air blowing even after the ice is gone
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Visible ice on the copper refrigerant lines outside
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Water pooling or leaking around the indoor unit
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The system is more than 8-10 years old
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You've already replaced the filter and it still freezes
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Weak or no airflow from the vents even with the fan on
Don't Let It Refreeze Tonight
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