Why Is Your AC Freezing Up?
Is your air conditioner not working as efficiently anymore? Ice formation due to poor maintenance or component breakdown may be to blame. When your AC is freezing up like this, its performance suffers and your energy bills increase.
Fortunately, there are ways to diagnose the problem. We’ll explain everything, including:
- Common reasons AC units freeze up
- Signs your AC is frozen
- Maintenance tips to prevent future AC freezes
- When it's time to contact a pro
- Benefits of working with Cooper Heating & Cooling
Ready to get started? Read on to keep your AC running efficiently.
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Common Reasons AC Units Freeze Up
When an air conditioner freezes, there’s usually a simple reason. The most common include:
- Airflow issues. Your AC’s evaporator coil needs constant airflow to prevent it from freezing. Check the filters and vents and clean your air conditioner to see if that solves the problem.
- System overload. If your thermostat is set too low, your AC runs constantly, causing freezing. Try raising the temperature if you’re experiencing this after prolonged operation. It might also be time to reconsider what size air conditioner you need.
- Drainage problems. If water lingers on your AC’s coils, it eventually freezes. Check for any clogs in the drain lines to keep things moving.
- Weather fluctuations. If your AC freezes up at night, it may be due to the drop in outdoor temperatures. More moisture also passes over your AC coils during humid days, increasing the risk of airflow or drainage issues causing freezing.
While you can handle the above problems yourself, freezing may also occur due to:
- Refrigerant leaks
- Thermostat malfunctions
- Expansion valve problems
- Compressor issues
You’ll need a professional to inspect and repair these larger, more in-depth issues.
Signs Your AC Is Frozen
Now that you know the common reasons your AC may freeze, how can you tell it’s happening? Well, there are usually telltale signs.
First, check the indoor unit for the following:
- Leaking water
- Hissing and other strange sounds
- AC coils freezing up or developing frost
- Reduced airflow through the vents
- Warm air output
Then, check the outdoor unit for:
- Excessive condensation
- Visible ice on the unit or the refrigerant lines
If you notice any of these signs, especially if you’re also experiencing an unexplainable rise in electricity usage, you’re likely dealing with freezing.
Maintenance Tips to Prevent Future AC Freezes
When your mini-split freezes, you’re left sweating, as your AC can’t perform at maximum efficiency. Luckily, regular maintenance can prevent the problem.
Follow these tips to keep your unit operating smoothly:
- Clean or replace AC filters every few months.
- Maintain a 2‑foot gap between the outdoor unit and any vegetation.
- Clean the outdoor unit’s vents with a hose or brush at least annually (with the power off).
- Clean the indoor unit’s evaporator coils annually.
- Inspect the drain line for clogs several times a year, and pour diluted bleach or a commercial AC cleaner down the line to kill algae and mold.
You should also always get an annual professional inspection. A pro can examine things you can’t, such as electrical contacts and the blower motor.
When It’s Time to Contact a Pro
If you’ve cleaned the filters, vents, drains, and evaporator coils, but the freezing continues, it’s usually time to contact a professional for further diagnosis. Ignoring the freezing can eventually lead to damage, inflating future repair costs.
However, taking things into your own hands can also be dangerous if you don’t know how to avoid hazards like capacitor discharges. Professionals have the tools, knowledge, and experience to handle AC failures quickly and safely.
Benefits of Working With Cooper Heating & Cooling
Looking for a professional in Colorado with the expertise to keep your AC from freezing? With more than 45 years of experience and a 99% first-visit repair record, Cooper Heating & Cooling has you covered. Even better, join the Cooper Green Club for twice-annual maintenance and discounts on emergency and routine repairs.
Get a No-Sweat AC Repair Estimate
Don’t let an iced-up air conditioner leave you in the heat. Contact us for an AC repair. We offer fast and convenient scheduling, free estimates, and a 100% satisfaction guarantee. Available 24/7, we handle any emergency.