Rusty Dilemma: How to Tackle Corrosion on Mini-Split Air Handlers

Rusty Dilemma: How to Tackle Corrosion on Mini-Split Air Handlers

Mini-split air handlers provide efficient and flexible climate control for homes and businesses. These compact and versatile systems can be a game-changer for maintaining indoor comfort. However, one common issue that mini-split owners face over time is the dreaded problem of corrosion or rust. In this blog post, we'll explore why rust forms on mini-split air handlers and share some valuable tips on how to tackle this pesky dilemma.


Understanding the Rust Problem

Rusting on a mini-split air handler can be caused by a variety of factors, including:

Moisture Exposure: Mini-splits are typically installed both indoors and outdoors, where they are exposed to humidity, condensation, and moisture from rain and snow. This moisture can contribute to the formation of rust.

High Humidity: In regions with consistently high humidity, the indoor unit can be prone to rust formation, especially if the area around the unit lacks proper ventilation.

Salt and Chemical Exposure: For mini-splits located near the coast or in industrial environments, exposure to salt, chemicals, or pollutants in the air can accelerate corrosion.


Tackling the Rusty Dilemma

Now that we understand why rust forms on mini-split air handlers, let's explore how to tackle this issue effectively.

Regular Cleaning: The first step in preventing rust is regular maintenance. Clean the air handler's exterior to remove dust, dirt, and moisture. Pay attention to areas where moisture can accumulate, such as drain pans. Clean or replace filters and this is an ideal time to disinfect the inside of your air handler. For easy home disinfection use the PureAC disinfecting device. No more breathing in mold, bacteria. With PureAC simply cover, press start and within 30 minutes have a completely disinfected system.

Monitor Humidity Levels: Managing indoor humidity is crucial. Investing in a dehumidifier or ensuring proper ventilation can help keep the indoor environment dry and reduce the risk of rust formation.

Rust Inhibiting Coatings: Some rust-inhibiting coatings or paints are available for metal surfaces. Consult with an HVAC professional to see if applying such coatings to your air handler is a viable solution.

Inspect for Damage: Regularly inspect the air handler for signs of rust and structural damage. If you notice extensive rust, it may be necessary to replace rusted components or even the entire air handler.

Professional Maintenance: An annual service check by a qualified HVAC technician can help identify and address rust issues before they become severe.

Consider a Protective Cover: If your mini-split air handler is exposed to the elements, consider using a weatherproof cover during periods of non-use, such as the winter season.


Remember that addressing rust promptly is essential to maintain the longevity of your mini-split system and ensure optimal performance.

Rust formation on mini-split air handlers can be a pesky dilemma, but with proper care and maintenance, you can prevent and tackle this issue effectively. By understanding the causes of rust, regularly cleaning and inspecting your unit, and considering rust-inhibiting coatings or covers, you can extend the lifespan of your mini-split air handler and continue to enjoy the benefits of efficient climate control. Don't let rust be a stumbling block; take action to keep your mini-split system in tip-top shape.

Back to blog

Click the button below to learn more or purchase PureAC