Need a Quick Fix for AC Freezing Up? We Got You! | DIY Home Comfort

Airflow is crucial to your air conditioner's proper functioning.

If there isn't enough air flowing over the evaporator coil, the coil can become too cold and freeze over.

Common causes of low airflow include a dirty air filter, blocked ductwork, or a faulty fan.

It's important to regularly clean or replace your air filter to ensure proper airflow of warm air. 

Additionally, check your ductwork to make sure it's not blocked by furniture, boxes, or other items. 

If your fan isn't functioning properly, it may need to be repaired or replaced.

Refrigerant is the substance responsible for cooling the air in your AC unit. 

If there isn't enough of it, the evaporator coil can become too cold and create ice. 

Refrigerant leaks are not uncommon, so it's worth having a professional check your system if you suspect this may be the issue.

It's important to note that adding more refrigerant is not always the solution. 

In fact, overcharging your air conditioning unit with refrigerant can cause even more problems. 

A professional HVAC technician can accurately diagnose and fix any refrigerant issues.

The intricate mechanical components of your air conditioner can fail and cause freezing. 

Faulty blower motors, closed supply vent, clogged condenser coils and issues with air flow to the compressor are all potential culprits.

If you suspect a mechanical issue, it's best to have a professional HVAC technician inspect and repair your central air conditioner system. 

Attempting to fix these issues yourself can be dangerous and may cause further damage to your air conditioner.

Your thermostat regulates the temperature of your home, so if there's a problem with it, your whole AC system could freeze up. 

Incorrect thermostat settings, a damaged thermostat, or a thermostat that isn't functioning properly can all cause issues.

Ensure your thermostat is set to the appropriate temperature and mode (cooling or heating). 

If your thermostat is damaged or not functioning properly, it may need to be replaced. 

A professional HVAC technician can help diagnose and fix any issues with your HVAC system or thermostat.

Now that we've covered some of the reasons why your air conditioner may be freezing up let's discuss some quick fixes for common causes.

One of the most common causes of insufficient airflow is dirty air filters. 

The filter should be changed or cleaned regularly, ideally every three months or so. 

If you haven't changed yours recently, take a look and see if it's clogged with dirt and debris.

If you suspect that your thermostat may be the issue, first check to make sure it's set to the correct temperature. 

If it is, try adjusting it by a few degrees to see if that makes a difference. 

If the thermostat isn't functioning properly, you may need to replace it.

If you suspect a problem with the evaporator coil, turn off your air conditioner and inspect it for ice buildup. 

If there is ice, let it thaw before cleaning the coil with a soft cloth and warm water. 

You can also use a commercial coil cleaner as directed.

The condensate drain line removes excess moisture from your AC. 

If it becomes clogged with dirt or debris, however, it can cause the system to freeze up. 

Inspect the drain line to check for clogs, and use a wet-dry vacuum or pipe snake to clear any obstructions.

📘 Related Reading: What is a Condensate Drain Line and Why It's Important

If you've tried these quick fixes and your air conditioner is still freezing up, it's time to call in the pros. 

There are a few instances when you should definitely seek professional help, including:

If you've tried all of the above fixes and your air conditioner continues to freeze up, there may be a more serious issue at play. 

Licensed HVAC technicians can diagnose and repair your frozen AC problem.

As mentioned earlier, low refrigerant levels can cause freezing. 

If you suspect a refrigerant leak, it's important to address it promptly, as it can be harmful to your health.

If you suspect a problem with the blower motor, compressor, or another critical component of your air conditioner unit, don't attempt to fix it yourself. 

An HVAC professional has the knowledge and expertise to diagnose and repair major mechanical issues safely.

Of course, the best way to deal with a freezing air conditioner is to prevent it from happening in the first place. 

Here are a few preventative measures you can take:

Regular maintenance is key to keeping your air conditioner running smoothly. 

Schedule annual tune-ups with a professional HVAC company to ensure your system is in top shape.

Make sure your air conditioner is properly sized for your home. 

An oversized unit will cool your home too quickly, which can cause the evaporator coil to become too cold and freeze up.

Be mindful of your thermostat settings and adjust them as needed. 

For example, if you're leaving for vacation, don't set your thermostat to an extremely low temperature thinking it will get cool air into your home faster. 

Instead, use a programmable thermostat to adjust the temperature throughout the day gradually.

Finally, ensure that your vents and ducts are clean and unobstructed.

 Dust and debris can accumulate over time, which can impede airflow and cause your air conditioner to freeze up.

A frozen AC unit can be frustrating, but with the right knowledge and tools, you can easily troubleshoot and fix the problem. 

Remember to perform regular maintenance, keep an eye on your thermostat settings, and seek professional help if needed. 

With these proactive measures, you can ensure that your air conditioner runs smoothly all summer long.

Want to learn more about your home's AC? Check out our other HVAC articles!

Scott Harding

Scott is the main author of DIY Home Comfort. He's also an experienced HVAC technician that enjoys home renovation and spending time with his family. You can find out more about him here.