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3 Solutions for a Frozen AC Unit During Winter

An air conditioner can freeze in all seasons due to how an AC provides cold air, and this problem can become more prominent in frigid conditions with high humidity. In Louisiana, one of the most humid U.S. states, many HVAC technicians get called for a frozen AC unit. 

At Airsmiths Cooling & Heating, we provide air conditioning services in Covington, LA, and the surrounding areas. Our team has dealt with more than its fair share of frozen air conditioners and knows how to fix the problem.

Three Frozen AC Problems and How to Fix Them

While the most common association with an AC is cool air, some also have heating functions. Regardless, all air conditioners function under what’s called the Joule-Thomson effect. This theory states if gas expands, then pressure and temperature will decrease.

Air conditioners use an evaporator coil to expand refrigerant and decrease its temperature. However, if something interrupts this process or causes it to malfunction, it can become too cold inside the unit. An AC also collects condensation as the air blows over the super cold coils, causing a freeze.

You can end up with a frozen air conditioner even in the summer, though they often appear during winter months. As you turn off your AC to let it dethaw, consider these reasons your AC might freeze.

#1. Poor Air Flow in Your System

An air conditioner pulls in air from your home and runs it over the evaporator coils. The coils, filled with refrigerant that is in a low-energy state, will absorb heat energy from the indoor air. With the heat now absorbed, the system pushes the cooled air back into the home.

The system cannot absorb heat from the indoor air if there is poor airflow. The refrigerant becomes colder without any heat to absorb, so any condensation the air manages to bring in freezes on the coils. Common culprits for poor airflow include blocked vents, clogged air filters, and a dirty condenser coil.

You can check your vents to see if any furniture or cloth blocks them. If you know how to change your air filters, try replacing them and see if that helps. Cleaning the outside of a condenser coil usually only requires compressed air or a soft brush to remove debris.

#2. Low Refrigerant Amounts in Your AC

As discussed with the Joule-Thomson effect, low-pressure amounts contribute to low temperatures and high gas amounts. This phenomenon occurs at the tops of mountains, where lower air pressure and low temperatures dwell, hence the snow.

Without enough refrigerant, your system creates a low-pressure environment in the coils. The low pressure decreases the temperature and freezes incoming condensation, leading to a frozen evaporator coil and other issues.

You cannot legally DIY a frozen AC unit with refrigerant problems. Refrigerants have many toxic properties that can harm your health and the environment. A licensed HVAC technician can work on this issue for you.

#3. Mechanical Issues Inside the AC Unit

Air conditioners have many mechanical parts that interact with each other to provide cool air. However, components like the fans or the compressor can malfunction, which can alter the pressure in the unit. Of course, low pressure equals low temperature, which may lead to freezing.

If you or a loved one has technical experience, you may be able to replace some components. You can legally do DIY repairs on fans, drain pans, and contactors. However, any parts that come in direct contact with refrigerants require a licensed professional.

Call Us for Your Frozen AC Repair

A frozen AC unit poses no challenge for us. Airsmiths Cooling & Heating has provided Covington, LA, with top-quality HVAC repairs, replacements, and maintenance since 1986. Our team constantly improves our knowledge to complete quick and efficient jobs while providing maintenance advice.

For more information or advice about an AC unit cover for winter months, Call Airsmiths Cooling & Heating today at 985-400-5093.

Schedule Your AC Repair Or Replacement Services

If your Heating Or AC system is not keeping you comfortable schedule a service call today.

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(985) 400-5093

What our customers are Saying



5-Star Google Rated

We have a widely trusted name across St. Tammany Parish for our AC Repair, Quality Of Work & Honesty.

We Service All Brands

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Family Owned. Locally Operated

We are a multi-generational family-run business established in 1986, in Southeast Louisiana and serve both residential and commercial clients.

Trained & Skilled Technicians

Each of our technicians are trained, certified, and undergoes continual training to ensure customer satisfaction at all times.

Frequently Asked Questions

Regular maintenance for your heating and cooling systems is often overlooked and can go a really long way in regards to extending equipment life and maintaining operating efficiency. As one of our maintenance contract customers, you get priority scheduling, discounted repair rates, discounted equipment purchases, and much more.

Warranty terms vary greatly depending on the manufacturer and installing dealer. We can verify all warranty terms by using the model and serial numbers located on the equipment. If you have a home warranty company you should contact them directly for service.

Our service fees range from $95-$145 and it covers our initial assessment of the system. With a proper assessment, we can then provided a flat rate cost to repair the system.

We service ALL makes and models! We are also a Carrier Factory Authorized Dealers & Carrier Infinity Product Specialists. Our well trained and Nate certified technicians can work on all systems

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Repair & Replacement Team Today!

When you’re looking for HVAC services in Mandeville or St. Tammany Parish that you can trust and afford, call our team here at Airsmiths Cooling & Heating. We ensure you get the best from your HVAC system. No matter what you need assistance with, we can help. Whether you require urgent repairs or you’d like to find out more about our cost-saving heating and cooling systems, we’ll be there for you.

Reach out to the experts at Airsmiths Cooling & Heating in Mandeville, serving the St. Tammany Parish area, and experience why we stand out as the top choice for HVAC services and plumbing. Don’t wait any longer, contact us today and discover unparalleled service and expertise!