How Do I Keep My Air Conditioner from Freezing up?

TL;DR: How Do I Keep My Air Conditioner from Freezing Up

Wondering how do I keep my air conditioner from freezing up? Ensure strong airflow by cleaning filters, checking the blower, and clearing blocked vents. Maintain refrigerant levels, keep coils clean, ensure proper tilt and drainage, and schedule regular HVAC maintenance to stay ice-free.

What causes air conditioners to freeze up?

1. Lack of airflow

• A malfunctioning blower motor- If the blower motor stops functioning, the air will not flow through the coils. Once airflow is stopped, the coils will start freezing. And if not checked and repaired, the freezing will only get worse. You can identify an almost faulty blower if the AC starts to make rattling sounds.
• Collapsed duct- The ducts guide the flow of air from the air conditioning system to the home. If they are blocks, then air cannot move through the system. Even if all other air conditioning components are running perfectly, you will experience countless issues, including AC freezing if the ducts are either blocked or collapsed.
• Clogged air filters- You should never neglect the air filter. Regular checks will prevent most AC issues. Air filters easily get blocked since they sit between the AC and the dusty home vent. But when they fill with mold or dust, the flow of air is restricted, causing your AC to freeze.
• Low fan voltage- Your home electricity voltage could be the culprit to your frozen air conditioner. Based on their capacity, ACs require a certain voltage to run efficiently. If the blower motor or fan is underpowered as the compressor runs, the AC might get frozen.

2. Low refrigerant

3. Blocked coils

4. Slow fan speed

5. Improper AC placement

How to prevent an air conditioner from freezing

• Have an HVAC technician check the refrigerant levels regularly- Low refrigerant levels are the most common causes of frozen air conditioners. With the low levels, the unit will attempt to run on less refrigerant. The result? A drop in pressure which in turn causes the evaporator coil temperatures to drop below the freezing point. The technician will check for possible leaks in a component that handles the refrigerant or the refrigerant lines.
• Replace the air filters- Dirty filters are the common culprits to most AC issues. Luckily, you can inspect, clean, or even replace the air filters even without the help of a technician. Not only will regular air filter replacements avert AC freezing issues but also improve the quality of air in your home. Most experts recommend replacing the filters every three months. However, depending on environmental factors and how often the AC is used, you can replace the filter after every month.
• Check the AC vents for blockage- Inspect the supply and return vents and ensure that they are not blocked. To prevent vent issues, move any furniture or home appliances that could restrict the flow of air through the vents.
• Inspect the condensate drain line- Air conditioners cool spaces by absorbing heat and transferring it to outdoor spaces. If any condensed moisture is trapped in the condensate drip tray with a clogged system, the water may eventually overflow and cause the AC to freeze. If the condensate drain line is blocked, you can use the suction power of a dry or wet shop vacuum to remove the trapped debris. If this fails, contact an HVAC technician to inspect the system.
• Check your blower fan and ensure it’s working efficiently- If the blower fan can’t generate airflow to prevent the coil from freezing, you might have endless AC issues. Contact a HVAC specialist to inspect the blower fan and check the wear and tear condition, the rotational speed, direction and power output.

• Ensure the window units maintain the correct angle.

Final thoughts

How Do I Keep My Air Conditioner from Freezing Up FAQs

What causes AC to freeze up?

How can I prevent my AC from freezing during high usage?

Can I fix ice buildup on AC coils myself?

When should I call a technician if my AC keeps freezing?