Although summer is usually associated with heat and sunshine, humid nights can create the perfect storm for your HVAC system to freeze. It sounds strange, but it’s a common issue especially if the system isn’t well maintained. Frozen coils can lead to weak airflow, system shutdowns, and costly repairs. Here’s what causes HVAC freezing and how you can prevent it.
Dirty air filters restrict airflow
When your air filters are clogged, your system can’t breathe. This limited airflow causes the evaporator coil to get too cold, eventually freezing over. To avoid this, replace your filters regularly every 30 to 90 days depending on usage. This simple step helps keep your HVAC running efficiently and prevents bigger problems down the line.
Need help changing or checking your filters? Our air duct cleaning service includes a full system inspection to ensure your air is flowing clean and free.
Closed or blocked vents can disrupt balance
If furniture, curtains, or rugs block your vents or if vents are closed entirely airflow becomes uneven. That imbalance can cool your evaporator coil too quickly, leading to ice buildup. Make sure all vents in your home are open and unobstructed to promote even air circulation.
Low refrigerant levels are a red flag
If your HVAC system is low on refrigerant due to a leak or aging components, it can trigger freezing. When pressure drops inside the coil, condensation forms and freezes. If you see ice on your outdoor unit or feel warm air indoors, it’s time to call in the pros. We recommend our AC inspection or condenser cleaning services to get your system back in top shape.
Routine maintenance keeps your system prepared
A frozen AC unit can be avoided with consistent checkups. Dust buildup on coils, blocked drain lines, and worn-out parts all contribute to freezing and should be addressed early. Our HVAC maintenance service is designed to catch issues before they become emergencies especially before the peak summer season hits.
Watch your thermostat settings at night
During hot and humid evenings, setting your thermostat too low can make the system work harder than necessary. This overcooling may cause condensation to freeze. Keep nighttime settings above 72°F to allow your system to rest and run efficiently.
Controlling indoor humidity helps prevent freezing
Excess humidity leads to excess condensation—especially in summer. When moisture builds up on the coils, freezing becomes more likely. Make sure your system’s drainage is working and consider using a dehumidifier if your home tends to hold moisture.
Keep your system cool – not frozen
Preventing HVAC freezing isn’t just about comfort—it’s about protecting your investment. By taking proactive steps and scheduling professional maintenance, you can avoid unexpected repairs and keep your home cool all summer long.
If you’ve noticed reduced airflow, strange noises, or ice around your HVAC unit, don’t wait for it to get worse. Schedule your maintenance or condenser cleaning with AAA Cleaning Services INC today.
