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How often you should replace your evaporator coil depends on several factors, including:

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• First,how well it’s cleaning the air. The evaporator coil filters contaminants from the air in your home. If you notice decreased airflow or heating performance, it may be a sign the coil is clogging up and we should replace the evaporator coil .

• Then,age of the evaporator coil. As a rule of thumb, evaporator coils generally require replacement after 10-15 years of use. Over time, the coil material starts to deteriorate and breakdown, reducing its effectiveness. If your coil is in this age range, it’s a good idea to check its condition and consider replacement.

• Also,usage of your AC/furnace. If you run your AC, furnace or heat pump continuously throughout the year, the evaporator coil will get dirty and corroded much faster than for seasonal or part-time use. Higher usage means the coil will likely need replacement more often.

• In addition,presence of damaging contaminants. Exposure to contaminants like mold, bacteria or industrial pollutants can accelerate coil breakdown and require replacement within 5-10 years.

• Moreover,visible damage or corrosion. Inspect your coil for cracks, holes, rusting metal orps splitting/tearing material. Any visible damage affects efficiency and should prompt replacement.

• In addition,diminished capacity or noisy operation. A failing evaporator coil will likely cause your AC/furnace to run noisily, lose capacity to heat or cool effectively and cost more to operate due to decreased efficiency. This is a sign the coil should be replaced.

As an estimate, here is a general guideline for when to consider replacing your evaporator coil:

•Normal usage and minimal contaminants: 10-15 years
•Moderate continuous usage: 8-12 years
•High continuous usage: 6-10 years
•Exposed to damaging contaminants: 5-8 years
•Visible damage present: Immediate replacement needed

Finally,replacing a failing evaporator coil will improve efficiency, reduce operating costs, improve comfort and help avoid other HVAC component issues down the road. It’s best to get a professional to inspect your coil and determine if it’s time for replacement. 

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