When summer temperatures climb in Burlington, your air conditioner should be keeping your home cool and comfortable. But if your unit starts losing power, blowing warm air, or acting oddly, you might be dealing with a frozen AC system. This issue can catch homeowners off guard, especially when things appear to be functioning normally at first glance. A frozen AC is more than an inconvenience—it can be a sign of larger issues and may lead to more expensive repairs if left unattended.
Addressing a frozen AC quickly can make a big difference. Once the system freezes up, it starts struggling to cool efficiently. It uses more electricity, puts unnecessary strain on the internal parts, and can even cause water damage as the ice melts. This is a common problem during Burlington’s high-temperature months when AC systems are running for longer periods. Catching the problem early can help protect both your comfort and your equipment.
Common Causes Of A Frozen AC Unit
Frozen AC units are often a result of problems with airflow or cooling components. In many Burlington homes, one or more of the following are usually the cause:
1. Low refrigerant levels
AC systems require an exact amount of refrigerant to absorb and release heat efficiently. When the refrigerant is low due to a leak or fault, pressure drops in the evaporator coil, causing it to get too cold. Instead of evaporating, moisture freezes on the coil, leading to ice build-up.
2. Dirty or clogged air filters
A blocked filter obstructs airflow. Without proper airflow, warm air cannot pass over the coil properly, making it more likely for frost to develop. This is one of the most overlooked and common causes of a frozen system.
3. Blocked or closed air vents
Vents that are covered, closed, or obstructed can interfere with airflow. When cold air can’t circulate as designed, temperatures inside the unit can drop, causing internal ice formation.
4. Faulty blower motor or fan
If the blower motor malfunctions or slows down, airflow becomes weak. Without steady air movement across the evaporator coil, freezing conditions are more likely to occur inside the system.
5. Thermostat malfunctions
When your thermostat is not accurately reading the room temperature, it can cause the AC to run longer than needed. Extended cooling cycles can drop the system’s internal temperature too low, leading to freezing conditions around the coil.
If your Burlington home has experienced poor airflow or extended cooling cycles, reviewing these areas may help pinpoint the issue. For example, even one closed vent in an unused room can disrupt the entire system’s balance and airflow pattern. These small things can lead to bigger problems when not corrected in time.
Signs Your AC Unit Is Frozen
Frozen AC units don’t always show obvious signs at first. Paying attention to small changes in performance can help you act before major damage occurs. Common signs of a frozen AC unit include:
– Ice or frost on the evaporator coil or refrigerant lines
– Weak or no airflow from vents while the AC is running
– AC system that runs non-stop but fails to cool your home
– Overall drop in indoor comfort levels
– Unexplained spike in electricity usage
Sometimes you might find water on the floor near your indoor unit. That usually indicates melting ice. You might also hear odd humming or buzzing noises if internal parts are straining to operate through the ice. Ignoring these warnings and continuing to run the system may lead to burnt-out motors, blocked refrigerant lines, or even compressor failure.
For Burlington homeowners, it makes sense to shut off the system quickly and follow a few key troubleshooting steps once these issues are noticed.
Steps To Troubleshoot And Resolve A Frozen AC Unit
Once you recognize the symptoms of a frozen AC, your main goal should be to reduce risk and begin recovery. Taking the following actions can help minimize damage:
1. Turn off the AC
Switch the unit off at the thermostat and circuit breaker. Allow the ice to melt naturally. Running the system while frozen places heavy strain on internal components and increases the potential for further damage.
2. Check the air filter
A dirty filter is often the trigger. Replace it if it is visibly dusty or hasn’t been changed in the last few months. Improved airflow helps support faster defrosting and prevents the issue from recurring.
3. Open all vents and registers
Walk through your home and confirm every vent is open, with no furniture or rugs restricting airflow. Good circulation plays a key role in preventing the coil from freezing again.
4. Inspect thermostat settings
Verify that the thermostat is set to a reasonable temperature. Switch it to auto mode instead of keeping the fan running in the “on” position. Incorrect settings can prolong cooling cycles or run the blower unnecessarily.
5. Schedule a professional check
If frost returns after trying these steps, or if limited airflow persists, call our technicians. Problems like refrigerant leaks or faulty motors need a trained eye. Our professionals can safely inspect, test, and repair the cooling system to restore function.
Repairing a frozen unit quickly avoids bigger issues later. Allowing the AC to keep freezing and defrosting repeatedly can lead to early wear and tear, reducing system lifespan and efficiency. Addressing the issue early, with both simple maintenance and professional help, reduces risk long-term.
Preventing Future Freeze-Ups
Once your AC has returned to normal function, prevention is the next key step. Reducing the risk of the same issue in the future is about consistency and awareness.
Here are a few ways homeowners in Burlington can avoid future freeze-ups:
– Check and replace air filters every 1 to 3 months
– Keep supply and return vents clean, open, and clear of obstructions
– Avoid frequent closing of interior doors that may block return airflow
– Book regular HVAC maintenance so technicians can check refrigerant levels and clean internal parts
– Pay attention to early signs of performance issues like uneven cooling or rising utility costs
Regular maintenance and attention to airflow make a big difference. An annual AC inspection can catch problems early—before cooling issues become emergencies. Keeping your AC working efficiently also reduces energy use and supports better overall comfort during the hottest days.
Keep Burlington Homes Cool, Comfortable, And Ice-Free
Frozen air conditioners are usually the result of preventable problems. Issues such as blocked airflow or faulty internal parts can lead to freezing. These problems are often slow to show themselves, making it important to act when the first warning signs appear.
Taking quick action to defrost your system, inspecting filters and settings, and scheduling an inspection when needed can help avoid long-term complications. Waiting too long or continuing to run a frozen AC can result in high repair costs or permanent damage.
Our technicians are here to help when the issue becomes too much to handle on your own. We identify the cause and take the proper steps to restore performance safely. With consistent upkeep and prompt response to irregular system behaviour, Burlington homeowners can stay cool all summer—without the worry of freezing coils or airflow failures. Let your AC do its job while you stay focused on enjoying your home.
If your air conditioning system in Burlington isn’t working the way it should, scheduling professional AC service in Burlington can help restore comfort and performance quickly. Trust B & G Heating Air Conditioning & Ventilation to deliver dependable solutions when your system needs attention. For a quick estimate or to book a service visit, please contact us today.
