When your air conditioning system is working hard to keep your home or business cool in the Texas heat, the last thing you want is for it to freeze up—literally. A frozen air conditioner isn’t just an inconvenience; it’s a sign that something is wrong within your HVAC system. At D-N-D Services, we’ve been helping homeowners and businesses across Rockwall and surrounding areas since 1997 with exactly these kinds of issues. Here’s what you need to know about why your AC might be freezing—and how to fix it.
Common Causes of a Frozen AC Unit
1. Restricted Airflow
One of the most common causes of a frozen air conditioner is poor airflow. Your AC needs a steady stream of warm air to keep the evaporator coils from freezing. When airflow is restricted, the temperature of the coils can drop too low, causing moisture in the air to freeze on the coils.
What causes restricted airflow?
- Dirty air filters
- Blocked or closed vents
- Obstructed ductwork
- Blower fan issues
At D-N-D Services, we routinely perform duct inspections, replacements, and air filter maintenance to help prevent these problems from occurring.
2. Low Refrigerant Levels
Another major culprit is low refrigerant. Refrigerant is the lifeblood of your AC system, and when levels are low due to leaks or improper charging, the pressure inside your system drops. This results in lower temperatures in the evaporator coil, which can then cause condensation to freeze.
Refrigerant issues should always be addressed by a licensed HVAC technician. Our NATE-certified professionals are trained to detect and repair leaks and recharge your system safely and efficiently.
3. Thermostat or Temperature Control Problems
If your thermostat is malfunctioning, it may be causing your AC to run longer than necessary, which can lead to freezing. Incorrect thermostat settings can also contribute to the issue—especially if the system is being forced to cool your home too quickly or below a reasonable temperature.
D-N-D Services technicians can inspect and calibrate your thermostat or recommend an energy-efficient smart thermostat that helps prevent future freezing issues.
4. Dirty Coils
Over time, dirt and debris can build up on the evaporator coils, reducing their efficiency and causing temperatures to drop too low. Regular HVAC maintenance, like coil cleaning, is key to preventing this.
At D-N-D Services, we offer professional maintenance plans that include thorough coil cleaning and performance checks to keep your system running smoothly all year long.
What to Do if Your AC Freezes Up
If you notice ice forming on your AC unit, here’s what you should do:
- Turn off the system immediately. Continuing to run a frozen unit can damage the compressor and other components.
- Switch the thermostat to “fan” mode. This will help thaw the ice faster while avoiding unnecessary strain on the system.
- Check your air filter. Replace it if it’s dirty or clogged.
- Inspect vents and ducts. Make sure nothing is blocked or closed off.
Once your system has thawed, monitor its performance. If it freezes up again, call a professional HVAC technician to diagnose the root cause.
Preventing Future Freeze-Ups
Regular maintenance is your best defense against frozen AC units. At D-N-D Services, we offer both residential and commercial HVAC maintenance agreements tailored to your needs. Our technicians attend factory training and are equipped to service all major brands including Carrier, Trane, Lennox, Goodman, and more.
Whether you’re in Rockwall, Garland, Greenville, or Dallas, D-N-D Services is just around the corner—and ready to help.
Conclusion
Freezing AC units are more than a seasonal inconvenience—they can lead to costly repairs if left unaddressed. Let D-N-D Services keep your system running at peak performance. With over two decades of experience, an A+ BBB rating, and NATE-certified technicians, you can trust us to deliver fast, reliable, and honest HVAC service.
Call us today to schedule a professional inspection or maintenance appointment. We’ll help you stay cool—and worry-free—all summer long.
D-N-D Services Heating & Air Conditioning is the premier choice for HVAC services in Rockwall. With a team of highly trained and certified technicians, we have the expertise to handle all of your heating, ventilation, and air conditioning needs. Our commitment to customer satisfaction is unmatched, and we always go above and beyond to ensure that your experience with us is positive. We use only the highest quality parts and equipment to ensure that your HVAC system is running at peak performance. Plus, we offer competitive pricing and flexible scheduling to fit your needs. Choose D-N-D Services Heating & Air Conditioning for all of your HVAC needs in Rockwall.
