Nobody expects to see ice on their air conditioner during the summer, but this problem isn't unusual. Whether you have a ductless mini-split system, central air conditioning, or a window AC unit, the root of the issue can typically be narrowed to the same origins. Here are some of the most common causes of this problem and how to resolve them.

Why Is There Ice on Your Air Conditioner?

1. Dirty Evaporator Coil

If the evaporator coil inside the AC isn't cleaned regularly, it can restrict airflow and cause ice formation. Dirty coils will make your unit work harder, using up more energy while producing less cool air. Iced over coils can also damage your compressor, so shut down your system and call an HVAC specialist to clean it.

2. Insufficient Air Flow

Besides the evaporator coils, other features can also reduce airflow. Air conditioners rely on heat exchange to provide you with cool air, so if something is preventing your system from removing the heat in your home, the temperature inside the unit will drop to freezing. Restricted airflow can be caused by many factors, such as a dirty air filter and dirty or damaged ductwork. In this case, you'll either need to clean your filter or have your ductwork serviced by a professional.

3. Damaged Components

Mechanical failures, such as a kink in your refrigerant lines, a misaligned blower motor, a blocked drain, or a clogged filter dryer, can alter the pressure in your air conditioner and cause freezing. It can be challenging to find component failures on your own, but if you notice unusual smells or noises alongside the presence of ice, you're likely dealing with a damaged part.

4. Low Refrigerant

When your air conditioner is low on refrigerant, that means it's being forced to expand the same amount as usual, despite there being less of it. Too much expansion cools the evaporator coil temperature below freezing, causing the moisture in the air to form ice on your coils. If your refrigerant is low, there's a good chance you have a leak, which can be fixed by an HVAC technician.

If you need an expert to come take a look at your air conditioner, get in touch with the experts at Mill Creek Heating in Turner, OR. For over 15 years, this family owned and operated company has provided reliable inspections, maintenance, repairs, and replacements for HVAC systems of all shapes and sizes. Their qualified technicians are committed to finding the best heating and cooling solutions for your home. For more information about their air conditioning services, visit their website. You can also call (503) 749-1000 to request a free estimate.