A frozen air conditioner coil is more than just an inconvenience, it’s a warning sign that something in your HVAC system isn’t working properly. Left unchecked, it can lead to reduced efficiency, system breakdowns, and expensive repairs. Fortunately, there are several practical steps homeowners can take to prevent this problem before it starts. Today, we at North Country Aire would like to share how to keep your AC running smoothly and ice-free.
Change or Clean Air Filters Regularly
One of the most common causes of frozen coils is restricted airflow, and a dirty air filter is usually to blame. When the airflow is blocked, the evaporator coil gets too cold, causing condensation to freeze instead of draining. To prevent this, check your filters monthly and replace or clean them at least every 30 to 60 days, especially during peak summer months.
Keep Vents & Registers Open & Unobstructed
Closing off vents in unused rooms may seem like a smart way to save energy, but it can actually cause pressure imbalances and reduce airflow through your system. Make sure all supply and return vents are open and free of obstructions like furniture, curtains, or rugs. Proper air circulation keeps the evaporator coil at a healthy temperature and prevents freezing.
Schedule Routine AC Maintenance
An annual professional tune-up can catch early signs of trouble, like a dirty evaporator coil, clogged drain lines, or low refrigerant levels, before they lead to freezing. A technician will also inspect electrical components, lubricate moving parts, and check refrigerant pressures to ensure your system is operating within safe and efficient parameters.
Check & Maintain Refrigerant Levels
Low refrigerant is another leading cause of frozen coils. When there’s not enough refrigerant, pressure drops inside the system, causing the coil to become too cold and freeze. If you notice ice buildup, hissing noises, or warm air coming from the vents, you may have a refrigerant leak. This is not a DIY fix, call a licensed HVAC technician to test and recharge your system if needed.
Keep the Evaporator Coil Clean
Over time, dust, mold, and debris can collect on the evaporator coil, forming an insulating layer that prevents proper heat transfer. This causes the coil to become excessively cold, leading to ice formation. During maintenance visits, your HVAC technician should clean the coils thoroughly, but you can help by keeping your air filter clean and your home as dust-free as possible.
Monitor Indoor Humidity Levels
High indoor humidity levels increase the risk of coil freezing because excess moisture condenses on the coil. Using a dehumidifier or keeping your home’s humidity between 30–50% with proper ventilation can help prevent this. Some modern thermostats even come with built-in humidity sensors to help you monitor and adjust conditions.
Central Air Conditioning Inspection, Troubleshooting, Diagnosis, Repair, Tune Up Maintenance & More in Mora, Cambridge, St. Francis, Oak Grove, North Branch & Greater Isanti, Minnesota
Frozen AC coils are a symptom of an underlying issue, usually related to airflow or refrigerant levels. Preventative steps like changing filters, keeping vents clear, and scheduling regular maintenance go a long way in avoiding costly repairs. If you ever notice ice on your unit, shut it down and call a professional to inspect it. Taking action early can keep your AC running efficiently and your home comfortably cool all summer long. Contact North Country Aire when you are air conditioning needs maintenance, repair, or other services.
