Five Reasons Why Your AC Unit Is Freezing Up at Night in Shelbyville, KY

You might assume that frost on your air conditioning’s evaporator or condenser coil means everything is in working order. Unfortunately, ice indicates a problem with the equipment, and ignoring it can jeopardize your system’s ability to keep your home cool and comfortable. If you’re asking, “Why does my AC keep freezing up at night?” you’re not alone.

At Air Support Heating and Cooling, we provide some of the best HVAC services in Shelbyville, KY, and we know how troubling a malfunctioning cooling system can be. Below, we outline the most common reasons ice forms on coils and what you can do to prevent it.  

Top AC Freezing Causes in Shelbyville

One or more of the following problems could be the culprit behind your air conditioning issues in Shelbyville.

1. Low Refrigerant Levels

Air conditioners circulate a specific amount of refrigerant between the evaporator and condenser coils to transfer warm indoor air to the outdoors. The cycle functions on a closed loop. If a leak occurs, the system won’t have enough of the chemical to remove and transfer the heat.

The lack of heat absorption causes ice to form on the coils. The equipment won’t resume standard operations until a technician recharges the refrigerant to restore the chemical’s optimal level. 

2. Thermostat Malfunction

Your thermostat may experience a malfunction that could cause HVAC performance complications. When it comes to icy coils, the temperature setting on your thermostat could be at fault. Maybe the temperature was set too low, or the device is in a place with lots of chilly drafts. Regardless of the reason, the equipment could cycle the cooling unit more frequently than necessary, which can trigger frost buildup on coils.

3. Blocked Airflow

If you are wondering, “Why does my AC keep freezing up at night?” the problem could be airflow restriction. 

Filters trap airborne particles, so they eventually clog with debris. It’s difficult for air to pass through filthy filters. Blocked vents and leaky ductwork can also restrict or minimize airflow, resulting in undue stress on the system and possible freezing.

4. Low Outdoor Temperature

Sometimes, air conditioners freeze because it’s too cold outside. Nighttime temperatures in Shelbyville could drop lower than anticipated, causing moisture on the evaporator coils to freeze. 

Outdoor temperatures must be within a certain range for cooling units to work correctly. Leaving the system on when outdoor temperatures drop affects the pressure within the equipment. 

5. Blower Motor Damage

The blower in centralized air conditioning draws in warm air from your Shelbyville property. It then blows conditioned air throughout the building. 

Unfortunately, your cooling system won’t work correctly without a functional blower motor to operate the fan. A malfunction in this component could prevent the system from completing the heat transfer process. If you continue running the unit, the condensation around the evaporator coil will freeze, and the system will eventually shut down.

AC Maintenance Tips To Prevent Icing at Your Shelbyville Property

Learning the answer to “Why does my AC keep freezing up at night?” is helpful when it comes to repairing problems, but the best way to address frost or ice buildup in cooling systems is to prevent it from happening. 

Consider these tips to keep your air conditioning ice-free:

1. Replace or clean dirty air filters to ensure good airflow. 
2. Ensure all vents are free of blockages from furnishings, decor and other items.
3. Contact an HVAC professional to inspect and clean the system’s coils.
4. Check refrigerant levels often and quickly address AC refrigerant issues.

How To Handle a Frozen Air Conditioner

If you notice a frost problem with your air conditioner, your first instinct may be to leave the system running or manually chip away at the ice. However, both options could cause more damage to the equipment, which increases the risk of system failure. 

Instead, turn the unit off and check for airflow obstructions like a filthy air filter or blocked vents. While you inspect the equipment, the frozen coils will defrost naturally. If the filter and vents are clear and the coils continue freezing after defrosting them, it’s time to contact a professional for help.