Designing HVAC Systems for Coastal Areas: Facing the Challenge of Salt-Laden Air

When designing mechanical systems, location matters significantly. Few environments are as punishing to HVAC equipment as coastal areas. If your project is within 5 miles of the ocean, your outdoor condensing units face a unique threat: salt-laden air.

That fresh ocean breeze can be delightful for living, but it’s brutal on metal.

The Challenges of Coastal Environments

Understanding Salt's Impact

Salt in the air accelerates galvanic corrosion, particularly in exposed HVAC components like coils, fins, and metal casings. This issue arises due to several reasons:

• Salt is hygroscopic, meaning it pulls moisture from the air and sticks to surfaces.

• Moisture, combined with oxygen and salt, creates an electrolytic environment — perfect for corrosion.

• The closer you are to the ocean, the higher the salt concentration in the air, especially in windy areas.

  
  

Over time, corrosion wears down materials, reduces system efficiency, and can lead to equipment failure much earlier than its expected lifespan.

The Cost of Corrosion

The financial implications of corrosion extend beyond mere repair costs. Frequent replacements can lead to significant financial strain. Ensuring your HVAC systems are durable in coastal conditions can save you thousands in the long run.

The Solution: Engineering for the Environment

Fortunately, MEP engineers have a set of proven strategies to combat coastal corrosion. These strategies are critical design decisions that can extend your system’s lifespan and save replacement costs.

1. Protective Coatings

One of the most effective defenses is applying anti-corrosion coatings to coils, fins, and housings. These coatings serve as a barrier against the salty air, decreasing the likelihood of oxidation. Some coatings are factory-applied (like epoxy or phenolic coatings), while others can be applied on-site.

2. Corrosion-Resistant Materials

Material selection is crucial. Engineers frequently choose aluminum, copper, or stainless steel, which naturally resist corrosion compared to untreated steel. Some manufacturers provide marine-grade units featuring these durable materials.

3. Regular Maintenance

Even the best materials and coatings require regular maintenance. Scheduled rinsing and maintenance are essential. Routine cleanings remove salt accumulation, particularly during hot or windy months when airborne salt concentrations peak.

🌬️ Other Environmental Factors We Consider

While coastal challenges are significant, they are not the only threats to MEP systems. Other harsh environments also require special consideration:

• Desert climates where high dust and debris levels can damage equipment.

• Industrial zones filled with airborne chemicals or particulates that may corrode any material.

• High-altitude locations facing intense UV exposure and extreme temperature fluctuations.

  
  

Each of these environments necessitates tailored protection strategies. For instance, what works in coastal Florida may not suffice in the Arizona desert.

💡 The Design Takeaway: Prioritize Early Planning

The earlier these challenges are considered during the design phase, the more effective your solutions will be. Waiting until construction or commissioning often limits available options and increases costs.

When clients ask, “Why do we need this upgraded material or coating?”, the answer is straightforward: We’re protecting your investment from day one. 

At Ardebili Engineering, we design with long-term performance in mind. We consider the environment, materials, and maintenance needs to help extend your system's life.

Final Thoughts on Coastal HVAC Design

Every challenge, even salty air, has a solution. In coastal environments, proactive strategies can make all the difference in ensuring your HVAC system remains efficient and effective for years to come.

To learn more about designing resilient HVAC systems, check out our services.

By integrating these strategies, we can significantly improve the durability and performance of HVAC systems in harsh coastal conditions. Don’t wait for corrosion to take its toll; invest in smart, sustainable design choices today.