Why Is My A/C Unit Freezing Up? Top Causes & Fixes from One Way Heating & Cooling
June 23, 2025 By: One Way Heating & Cooling
When your A/C unit starts freezing up or you see ice forming on the coils, it’s a signal that your system isn’t working the way it should. Not only does this problem reduce your home’s comfort, but it can also cause serious damage if left unaddressed. If you live in El Paso, TX, and are wondering, “Why is my A/C unit freezing up?,” you’re in the right place. We’ll walk you through the most common causes, what it means for your system, and how One Way Heating & Cooling can help you get back to cool, worry-free air.
What Does It Mean When Your A/C Coils Freeze?
Your A/C unit works by circulating refrigerant through coils to absorb heat from the air inside your home and release it outside. The evaporator coils inside your unit should stay cold enough to cool air but not so cold that moisture in the air freezes on them. When ice builds up, it means there’s a disruption in the balance between airflow, refrigerant levels, or system operation. This ice blocks air from flowing properly and can cause your A/C to stop cooling effectively, or even damage key components.
Common Reasons Why Your A/C Coils Are Freezing
1. Restricted Airflow
Airflow is vital for maintaining the right coil temperature. If the air can’t flow freely over the evaporator coils, they get too cold and start freezing. Here’s what typically restricts airflow:
Dirty or clogged air filters: If you haven’t changed your air filter recently, dust and debris can block air.
Closed or blocked vents: Furniture or other objects blocking vents reduce airflow.
Blower fan problems: A malfunctioning blower fan won’t push enough air over the coils.
Regular filter replacement and ensuring vents are clear can often prevent coil freezing.
2. Low Refrigerant Levels
Refrigerant is the coolant that absorbs heat from inside your home. When levels are low due to leaks or inadequate charging, the pressure inside the evaporator coil drops. This causes the coil temperature to fall below freezing, creating ice buildup.
Detecting refrigerant leaks and safely recharging your system requires a professional technician. Don’t try this yourself, refrigerant handling requires special tools and certifications.
3. Dirty Evaporator Coils
Over time, dust, dirt, and grime accumulate on the evaporator coils. This layer acts like insulation, preventing the coils from absorbing heat efficiently. When the coils can’t absorb heat properly, they become too cold and ice forms.
Annual professional HVAC tune-ups usually include coil cleaning to prevent this problem.
4. Thermostat Malfunctions or Incorrect Settings
If your thermostat is set too low or isn’t working correctly, your A/C might run longer than needed, causing coils to freeze. Upgrading to a programmable or smart thermostat can help regulate temperatures more precisely and prevent freezing.
5. Mechanical or Electrical Issues
Sometimes the cause is a failing blower motor, stuck expansion valve, or other mechanical parts that affect refrigerant flow or airflow over the coils. These issues require expert diagnosis and repair.
Why Ignoring a Freezing A/C Can Cost You More
You might be tempted to wait it out, but a freezing A/C can lead to:
Compressor damage: Ice restricts refrigerant flow, which can strain and damage the compressor, one of the most expensive parts to replace.
Higher energy bills: A freezing coil causes your system to work harder, using more electricity.
Reduced cooling efficiency: Ice blocks heat exchange, so your home stays warmer.
Complete system shutdown: In severe cases, the system might stop working altogether.
How One Way Heating & Cooling Can Help in El Paso, TX
If you spot ice on your A/C coils or notice your system struggling to cool, it’s time to call in the experts. One Way Heating & Cooling has the knowledge, experience, and tools to quickly diagnose why your A/C is freezing up and fix it.
Their comprehensive service includes:
Refrigerant leak detection and recharge
Airflow inspections and blower repairs
Air filter replacements and coil cleanings
Thermostat troubleshooting and upgrades
Preventive maintenance plans to keep your system running smoothly year-round
By trusting One Way Heating & Cooling, you get reliable, local professionals who understand El Paso’s climate and HVAC needs.
How to Prevent Your A/C From Freezing Up
To avoid the headache of a freezing A/C in the future, keep these tips in mind:
Replace air filters every 1-3 months.
Keep vents and registers clear of furniture or obstructions.
Schedule annual professional HVAC maintenance.
Check thermostat settings and upgrade if necessary.
Watch for early signs of coil freezing like reduced airflow or water dripping around your unit.
Conclusion
A freezing A/C coil is more than just a nuisance, it’s a warning sign your system needs attention. From restricted airflow to low refrigerant, multiple issues can cause coil icing, but most are preventable or fixable with expert care.
If you’re dealing with a freezing A/C in El Paso, don’t wait until it causes costly damage. Contact One Way Heating & Cooling today for fast, professional service that will restore your comfort and keep your home cool all summer long.