How to Best Protect Your Air Conditioner from Corrosion

An air conditioner is not only a luxury, but it is a refuge for most from the unbearable sun’s heat during the warm seasons. Besides controlling the interior comfort of homes, they also act as lungs that filter the air we breathe in to make our settings comfortable.

Despite their robust engineering, these machines are not invincible, especially when it comes to the natural enemy of metal: corrosion. The risk of AC coil corrosion, a particularly pernicious form, increases with exposure to salty sea breezes, high humidity, and industrial pollutants.

Left unchecked, this corrosion can reduce efficiency and the lifespan of the unit, leading to costly repairs or replacements.

This blog is dedicated to unraveling the mystery of corrosion in air conditioners.

We at PSB Air will provide homeowners with practical tips and effective strategies to shield these cooling systems from the ravages of corrosion, using everything from rust protection coatings to natural corrosion inhibitors.

What is Corrosion in Air Conditioning and What Causes it?

Corrosion is a relentless natural process that results from the chemical interaction between metal and its environment, leading to the gradual deterioration of the material.

In the realm of air conditioners, this deterioration is not just a cosmetic issue—it’s a battle against AC coil corrosion, which can severely impair the system’s functionality. The coils, responsible for the heat exchange process, are particularly vulnerable because they are consistently exposed to moisture and are often made of metals that react with the elements.

Other susceptible parts include the outdoor unit’s cabinet, refrigerant lines, and electrical connections. When these components corrode, the efficiency of the air conditioner drops significantly, requiring more energy to cool the same space.

Furthermore, corrosion can cause refrigerant leaks and electrical failures, drastically shortening the overall lifespan of the unit. Ensuring that these vital parts are protected is crucial to maintaining the unit’s performance and avoiding the premature need for replacement.

Preventative Measures to Protect from Corrosion

Preventative measures are the first line of defence in safeguarding air conditioners from the insidious effects of corrosion.

Regular maintenance and inspections are pivotal, as they not only keep the AC running smoothly but also provide an opportunity to catch and address early signs of AC coil corrosion.

Seasonal check-ups by our professionals ensure that potential issues are identified before they escalate into serious problems.

Equally important is the careful selection of the unit’s installation site. An ideal location is one that minimizes the air conditioner’s exposure to corrosive elements like salt-laden air for coastal regions or industrial emissions in urban settings. Such strategic placement can significantly reduce the risk of corrosion.

Advancements in materials science have ushered in the use of rust protection coatings that can be applied to metal parts to ward off corrosion.

These rust protection coatings create a barrier, shielding the metal from moisture and contaminants. Some coatings are specifically designed to endure harsh conditions and are imbued with natural corrosion inhibitors, which provide an extra layer of defence.

Additionally, manufacturers are increasingly using materials such as aluminium and alloys that are inherently resistant to rust, further fortifying the air conditioner against the threat of corrosion.

Adopting these measures extends the unit’s life and optimizes its performance, ensuring that the cool air continues to flow uninterrupted.

Routine Cleaning and Maintenance

Routine cleaning and maintenance play a pivotal role in preventing the buildup of corrosive substances on air conditioning units. A fundamental aspect of regular care involves the gentle washing of the condenser and evaporator coils.

Removing debris, dust, and other particulates prevents the accumulation of materials that can hold moisture against the coils, thereby reducing the risk of AC coil corrosion.

Our professional servicing goes beyond superficial cleanliness. Technicians inspect for early signs of wear and apply rust protection coatings as a preemptive measure against corrosion.

They are trained to spot the initial indicators of potential problems, such as discolouration or pitting on metal components, which can be early warnings of corrosion taking hold.

Furthermore, regular maintenance includes changing air filters, which not only improves air quality and airflow but also prevents the overworking of the AC unit—a condition that could exacerbate wear on components.

Technicians also check refrigerant levels during routine service visits, as low levels can cause the compressor to run hotter and work harder, increasing the likelihood of corrosion.

By adhering to these maintenance practices, the integrity and efficiency of the air conditioner are maintained, ensuring it operates at peak performance for as long as possible.

Protective Coatings and Treatments

Protective coatings and treatments are specifically formulated to safeguard air conditioning units from the harsh elements that lead to corrosion.

These products often include rust protection coatings, which create a resilient barrier over metal surfaces, repelling water and contaminants.

Moreover, some coatings are enhanced with natural corrosion inhibitors, providing a double shield against corrosive chemical reactions.

While there are DIY options available for the application of such coatings, professional application is typically recommended.

Professionals possess the expertise to apply these coatings evenly and comprehensively, ensuring that no vulnerable areas are missed.

They are also trained to prepare the surface properly—a crucial step for the effectiveness of the treatment.

For optimal protection and longevity of your AC unit, investing in professional coating services offered by PSB Air is a wise decision.


The battle against corrosion in air conditioning units is ongoing and requires a multifaceted approach.

Understanding the chemistry of corrosion, implementing preventative strategies, and adhering to routine maintenance are essential for keeping your AC in top condition.

Protective coatings and treatments offer an additional layer of defense, mainly when applied by PSB Air professionals.

By taking these steps, homeowners can extend the life of their air conditioners, maintain energy efficiency, and ensure continued comfort throughout the seasons.

Remember, the cost of prevention always pales in comparison to the expense of repair or replacement—protection against corrosion is an investment in peace of mind.


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