That blast of cool air on a warm Mokena day is something we often take for granted. But what happens when your air conditioner starts acting…frosty? While it’s counterintuitive, it’s not uncommon for an AC unit in Mokena to freeze, even on a warmer day. While a frozen evaporator coil can come as a surprise, there’s no need to sweat it (at least not too much).

At TemperaturePro Mokena, we understand how crucial a functioning AC is, especially during the summers. That’s why we want to shed some light on this problem, explain why it happens, and what you should do if you suspect a frozen evaporator coil at your home in Mokena.

Graphic illustrating how an evaporator coil works in a heat pump air conditioner.

What is an Evaporator Coil and Why Does it Matter?

Think of your evaporator coil as the heart of your air conditioning system’s cooling process. Located within your indoor unit, this coil is filled with refrigerant. As warm air from your Mokena home is blown across the cold evaporator coil, the refrigerant absorbs the heat. This cooled air is then circulated back into your living spaces, providing that much-needed relief.

The Chilling Truth: Why Evaporator Coils Freeze Up

So, why would this vital component suddenly turn into an ice block? Several factors can contribute to a frozen evaporator coil:

  • Dirty Air Filters: The Number One Culprit. Just like the Illinois dust and pollen can accumulate on your windows, it can also clog your AC’s air filter. A dirty filter restricts airflow, preventing enough warm air from passing over the coil. This lack of warm air causes the coil to become too cold, leading to condensation freezing on its surface. Regularly changing your air filter is the easiest way to prevent this!
  • Restricted Airflow Elsewhere: Beyond the filter, blocked return or supply vents, closed dampers, or even a dirty blower wheel can hinder proper airflow across the coil. Make sure furniture and other obstructions aren’t blocking your vents.
  • Low Refrigerant Levels: A Silent Problem. Refrigerant is the lifeblood of your AC. If your system is low on refrigerant (due to a leak), the pressure in the system drops, causing the evaporator coil to get excessively cold – cold enough to freeze moisture. This is a problem that requires professional attention.
  • Mechanical Issues: Sometimes, a malfunctioning blower motor won’t circulate air effectively, even with a clean filter. Thermostat problems that cause the AC to run constantly can also lead to freezing.
  • Running the AC in Cold Weather: While Mokena doesn’t often see extended periods of cold during typical AC usage, running your air conditioner when outdoor temperatures are consistently below 60°F can sometimes cause the coil to freeze.

Mokena HVAC technician using screwdriver to repair AC evaporator coil.

What Should a Mokena Homeowner Do If They Suspect a Frozen Coil?

If you notice reduced airflow, weak cooling, or visible ice on your indoor AC unit, here’s what you should do:

  • Turn Off Your AC Immediately: This is crucial to prevent further damage to your system.
  • Switch Your Thermostat Fan Setting to “ON”: This will circulate warmer room air over the frozen coil, helping it to thaw.
  • Check and Replace Your Air Filter: As mentioned, a dirty filter is a primary cause.
  • Ensure Vents Are Open and Unobstructed: Take a quick walk around your home to check for any blockages.
  • Wait for the Coil to Thaw Completely: This can take several hours. Don’t rush the process.
  • Monitor After Thawing: Once thawed, turn your AC back on and see if it cools properly. If the coil freezes again, it indicates a more serious underlying issue.

When to Call the Mokena HVAC Experts at TemperaturePro

While some causes like a dirty filter are easy to address yourself, a recurring frozen evaporator coil often signals a more complex problem, such as a refrigerant leak or a mechanical malfunction. These issues require the expertise of a certified HVAC technician.

Don’t let a frozen evaporator coil leave your Mokena home feeling like a sauna! If you suspect a problem or want to ensure your AC system is running efficiently and reliably, book online with the team at TemperaturePro Mokena. We’re your local experts for AC repair, maintenance, and installation.