Kens Heat and Air

How long do AC coils last?

how long do ac coils last
Learn about the lifespan of AC coils and how to prolong their longevity. Find out the signs of a failing AC coil and when to replace it.


When it comes to keeping our homes cool during the scorching summer months, air conditioning systems play a crucial role. One of the essential components of an AC system is the coils. AC coils are responsible for transferring heat and cooling the air that circulates through your home. Over time, however, these coils can deteriorate and become less efficient, affecting the overall performance of your AC unit.

So, how long do AC coils actually last? In this article, we’ll explore the lifespan of AC coils, signs of a failing AC coil, and when it’s time to consider replacing them. By understanding these factors, you can ensure the longevity and efficiency of your AC system, saving you both money and discomfort during the hot summer months.

Table of Contents

Lifespan of AC Coils

The lifespan of AC coils can vary depending on various factors, including the quality of the coils, usage patterns, maintenance, and climate conditions. On average, AC coils can last anywhere between 10 to 15 years. However, with proper care and maintenance, you can extend their lifespan and ensure optimal performance.

It’s important to note that the lifespan of AC coils also depends on whether you have an indoor coil or an outdoor coil. Outdoor coils are typically exposed to harsher weather conditions, such as extreme heat, cold, and humidity, which can accelerate wear and tear. Indoor coils, on the other hand, are usually protected from these external factors and may last longer.

Signs of a Failing AC Coil

Over time, AC coils can deteriorate due to factors such as dirt, debris, corrosion, and normal wear and tear. When AC coils start to fail, you may notice certain signs indicating that it’s time to take action. Some common signs of a failing AC coil include:

  • Reduced cooling efficiency: If you notice that your AC system is no longer cooling your home as effectively as it used to, it could be a sign that the coils are failing.
  • Frequent breakdowns: A failing AC coil can put additional strain on the entire system, leading to more frequent breakdowns and the need for repairs.
  • Increased energy bills: When AC coils are not functioning properly, your system has to work harder to cool your home, resulting in increased energy consumption and higher utility bills.
  • Icing or frost on the coils: If you see ice or frost forming on the coils, it indicates that they are not properly absorbing heat and need attention.
  • Strange noises: Unusual noises coming from your AC unit, such as hissing or banging sounds, can be a sign of a failing coil.

If you notice any of these signs, it’s important to have a professional HVAC technician inspect your AC system and diagnose the issue. Ignoring a failing AC coil can lead to further damage and costly repairs down the line.

When to Replace AC Coils

Knowing when to replace your AC coils is crucial for maintaining the efficiency of your air conditioning system. While the lifespan of AC coils is typically around 10 to 15 years, there are certain situations where replacement may be necessary even before that time frame:

  • Severe damage or corrosion: If your AC coils are severely damaged or corroded, they may need to be replaced regardless of their age. This is especially true for outdoor coils that are exposed to harsh weather conditions.
  • Inefficient cooling: If your AC system is no longer cooling your home effectively, even after routine maintenance and repairs, it may be a sign that the coils are beyond repair and need to be replaced.
  • Frequent breakdowns: If your AC system is experiencing frequent breakdowns and repairs, and the issue is traced back to the coils, replacement may be the most cost-effective solution in the long run.

When it comes to replacing AC coils, it’s important to consult a professional HVAC technician who can assess the condition of your coils and provide expert advice. They will be able to determine whether replacement is necessary or if other repairs or maintenance can restore the functionality of your AC coils.

Maintaining AC Coils

Proper maintenance is key to prolonging the lifespan of your AC coils and ensuring optimal performance. Here are some maintenance tips to keep your AC coils in good condition:

  • Regular cleaning: Dust, dirt, and debris can accumulate on the coils, reducing their efficiency. Regularly clean the coils to remove any build-up and improve airflow.
  • Change air filters: Clogged air filters can restrict airflow and put additional strain on the coils. Replace air filters regularly to maintain proper airflow and prevent damage to the coils.
  • Schedule professional maintenance: Regular professional maintenance by an HVAC technician can help identify and address any issues with your AC coils before they become major problems.
  • Keep the area around the outdoor unit clear: Ensure that the area around the outdoor unit is clear of any plants, debris, or other obstructions that can impede airflow and potentially damage the coils.

By following these maintenance practices, you can maximize the lifespan of your AC coils and keep your air conditioning system running smoothly.


How often should AC coils be cleaned?

AC coils should be cleaned at least once a year, preferably before the start of the cooling season. However, if you live in a particularly dusty or polluted area, more frequent cleaning may be necessary.

Can AC coils be repaired?

In some cases, AC coils can be repaired if the damage is minor. However, severe damage or corrosion may require replacement of the coils. It’s best to consult a professional HVAC technician to assess the condition of your coils and determine the best course of action.

What is the cost of replacing AC coils?

The cost of replacing AC coils can vary depending on factors such as the type of coils, the size of the unit, and the region you live in. On average, the cost can range from $1,000 to $2,500. It’s recommended to get multiple quotes from reputable HVAC contractors to ensure you’re getting the best value for your money.


AC coils are an integral part of your air conditioning system, responsible for cooling the air that circulates through your home. Understanding the lifespan of AC coils, signs of a failing coil, and when to replace them can help you maintain the efficiency of your AC system and avoid costly repairs.

By following proper maintenance practices and seeking professional help when needed, you can ensure that your AC coils last as long as possible, keeping your home cool and comfortable even during the hottest summer days.

Share the Post:

Related Posts

Join Our Newsletter