Cleaning AC Coils

What Are AC Coils?

Your AC system depends on two essential components: evaporator coils and condenser coils. The evaporator coils inside your home or business pull heat from the indoor air, and the condenser coils in the outdoor AC unit push that heat outdoors. This ongoing cycle cools your space. Coils are made of metal, usually copper or aluminum, and their tightly packed design maximizes surface area for efficient heat transfer. Your air conditioner can't cool your space properly without clean, functioning coils.

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Why Is Cleaning AC Coils Important?

Dust, hair, pollen, and even tiny insects can build up on AC coils. As debris collects, it creates a barrier that blocks airflow and disrupts cooling. This forces your AC unit to use more energy, and the added stress increases the chance of a breakdown. A dirty AC compressor might have to run longer to achieve the same cooling, raising energy bills and shortening its lifespan. Even worse, grime on the coils can attract mold and bacteria, circulating unhealthy air through your vents. Cleaning AC coils is a necessary part of protecting both your HVAC investment and your indoor air quality.

Signs Your AC Coils Need Cleaning

A few signs tell you it's time to clean AC coils. If your air conditioner starts blowing warm air when it should be cold, it could be due to blocked coils. Another common clue is poor airflow from the vents or uneven cooling in different rooms. You might also notice a persistent musty smell, indicating microbial growth on dirty coils. An unexplained rise in your electric bill or ice forming on the coils are also signs of trouble. These problems may seem small initially, but they can quickly become expensive if ignored.

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How to Clean AC Coils Step by Step

Professionals follow a careful, proven process when cleaning AC coils. With evaporator coils, the technician turns off the system, opens the indoor unit, and gently brushes away surface dirt. Then, they apply a no-rinse cleaning solution designed to loosen stuck-on grime. The technician removes the unit's cover for condenser coils outside, clears out leaves or dirt, sprays on coil cleaner, and rinses with low-pressure water. This thorough yet gentle process ensures the coils are clean without bending or damaging their delicate fins. It's a job best left to those who do it every day.

Best Cleaning Solutions for AC Coils

Professionals use specialty products to clean AC coils safely and thoroughly. These cleaners are non-corrosive and made for HVAC systems, unlike harsh household chemicals or DIY mixtures that can damage the metal or insulation. The foam clings to the coil surfaces and lifts away buildup without scrubbing. These solutions also rinse clean without leaving residue that could attract more dust. Choosing the right cleaner is essential to keeping your coils in good shape and your AC system running smoothly.

How Often To Clean AC Coils

AC coils should be cleaned at least once a year. However, if you live near a busy street, have pets, or operate a commercial kitchen, your system might need more frequent attention. During seasonal AC maintenance, a technician will check the coils and let you know if cleaning is necessary. A clean coil allows your AC unit to function at peak efficiency, so staying on top of this task saves money in the long run and helps avoid mid-season breakdowns.

Preventative Maintenance Tips for AC Coils

A few habits can help you avoid issues with your AC coils. First, change your HVAC filter regularly. Filters trap the dust and particles that would otherwise settle on the coils. For most homes, every 90 days is enough, but once a month is better if you have allergies or pets. Also, make sure your outdoor AC unit has plenty of breathing room—keep bushes, weeds, and yard waste away from it. Installing a UV light inside your system can also prevent mold and mildew from growing on the evaporator coils. And don't forget to schedule yearly AC service to keep everything in check.

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