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Tag: anti-corrosion

  • How Long Does an HVAC Unit Actually Last?

    How Long Does an HVAC Unit Actually Last?

    If you’ve ever Googled this question while staring at a 15-year-old rooftop HVAC unit, you’ve probably seen the same answer over and over: 15 to 20 years. And that’s a fair starting point. But it’s also kind of like saying “the average person lives to 77.” True on paper, but not all that useful once you start asking why some people (and some HVAC systems) make it well past that, while others don’t.

    Let’s break down what the average lifespan actually looks like, what speeds up the aging process, and what you can do about it.

    So, What’s the Real Number?

    Most HVAC industry sources land on 15 to 20 years for a typical commercial system, and ASHRAE’s own Service Life and Maintenance Cost Database backs that up at the component level. Air conditioners and heaters generally last 15 to 20 years, heat exchangers 15 to 25 years, and boilers can last 20 to 30 years. Some sources put the practical range even wider, 10 to 35 years, depending heavily on equipment type, build quality, and how the unit is treated over its lifetime.

    That range is the honest answer. There isn’t one number that applies to every HVAC unit, because lifespan isn’t really about age. It’s about wear. And wear depends almost entirely on a handful of controllable factors.

    What’s Actually Shortening Your HVAC Unit’s Life

    Installation quality. A poorly sized or improperly installed system starts its life already working too hard. Incorrect refrigerant levels, bad ductwork connections, or a unit that’s too small for the space can quietly shave years off the lifespan before it even hits its first service anniversary.

    Maintenance habits. This is the big one. Systems that get routine filter changes, coil cleanings, and seasonal inspections consistently outlast neglected ones, often by years. Skipping maintenance doesn’t just risk a breakdown; it also accelerates the everyday wear that adds up over time.

    Climate and outdoor exposure. Rooftop HVAC units in hot, sunny climates take a beating that lab testing doesn’t fully account for. Direct sun exposure can push exterior cabinet temperatures to 180°F or higher, even on a mild day, forcing the unit to work harder just to keep up. Coastal environments add another layer of stress: salt-laden air settles on coils, accelerating corrosion dramatically faster than it would inland.

    Coil corrosion and fouling. Here’s the one people underestimate. The coil is where your system actually exchanges heat, and it’s also one of the most vulnerable parts. Corrosion from moisture, salt, and airborne chemicals eats away at the coil’s surface, while fouling from dust, debris, and biological growth coats it like a blanket. A dirty or corroded coil can significantly increase energy consumption and shorten the total system life by several years on average. And the problem compounds on itself: fouling traps moisture, moisture accelerates corrosion, and corrosion creates more surface area for fouling to stick to.

    Why the HVAC Unit’s Coil Deserves More Attention Than It Gets

    Most people think about HVAC lifespan in terms of the whole unit, i.e., the compressor, the fan, and the cabinet. But a huge amount of that lifespan is actually decided at the coil level. Once corrosion starts, it doesn’t just sit there. It pits the metal, creates the conditions for refrigerant leaks, and forces the compressor to work overtime trying to compensate for a coil that can’t transfer heat the way it used to. By the time someone notices the energy bill creeping up, the coil has often already been losing efficiency for a while.

    This is exactly the gap protective coatings are designed to close.

    How Coat Zone® Coatings Extend That Lifespan

    Coat Zone® offers two coatings that address different aspects of wear-and-tear.

    CoilSafe® goes directly onto the coil. It’s an ultra-thin inorganic coating, just 8 to 10 microns, about 40 times thinner than a standard epoxy coating, that bonds at a molecular level, restoring the fin-to-tube connection that corrosion degrades over time. It also creates a glass-like, antimicrobial surface that resists mold, moisture, and the debris that causes fouling. The result is a 10% improvement in HVAC efficiency and corrosion protection, validated through 6,000 hours of salt-fog testing. In other words, it interrupts the corrosion-fouling cycle before it can cost you years of equipment downtime.

    ThermalBlock™ (or ThermalBlock by Coat Zone®) tackles the other half of the problem: solar heat. Applied to the exterior cabinet of rooftop units and exposed ductwork, it blocks up to 93% of solar heat and keeps surface temperatures within 10°F of ambient air, even at the peak of summer. Less heat soaking into the cabinet means less strain on the compressor and fewer hours of unnecessary run time, both of which directly translate into a longer service life. ThermalBlock™ (or ThermalBlock by Coat Zone®) has been shown to extend HVAC lifespan by up to 30%.

    Used together, the two coatings address the two biggest outdoor stressors on an HVAC unit, thermal load from the outside and corrosion from the inside out, without requiring a system replacement or major capital investment. Most clients see a return on that investment within 12 to 36 months, just from the energy savings alone.

    The Bottom Line

    Fifteen to twenty years is a reasonable baseline, but it’s not a guarantee, and it’s definitely not a ceiling. Whether your HVAC system lands on the low end or the high end of that range comes down to how well it’s protected against the things that actually wear it out — heat, corrosion, and fouling chief among them. Protect those weak points, and you’re not just avoiding an early replacement. You’re getting more efficient, more reliable years out of the equipment you’ve already paid for.

    Curious how much life is left in your system, or how to protect a new one from day one? Reach out to our experts to learn more.

    Citation List

    • United Mechanical Services. “What is the Lifespan of Your Commercial HVAC Equipment?” unitedmech.com
    • Riddleberger Brothers, Inc. “How Long Does Commercial HVAC Equipment Last?” rbiva.com
    • Temaroofing Services. “How Long Does A Commercial HVAC System Last?” (citing the ASHRAE Service Life and Maintenance Cost Database) temaroofingservices.com
    • Solace Enterprises. “How Long Do HVAC Systems Last?” solace-ent.com
    • ReCoil HVAC. “How Corrosion Impacts Commercial HVAC Systems (And How to Prevent It).” recoilhvac.com
    • The Furnace Outlet. “How a Dirty Evaporator Coil Can Ruin Your Efficiency (and Your Energy Bill).” thefurnaceoutlet.com
    • Super Radiator Coils. “Causes & Solutions to Airside Coil Fouling.” superradiatorcoils.com
  • Understanding ASTM G31 and the Power of Covalent Coatings

    Understanding ASTM G31 and the Power of Covalent Coatings

    In the world of infrastructure and manufacturing, corrosion is the “silent killer.” For metals submerged in harsh environments, like the salty, turbulent depths of the ocean, protection isn’t just a preference; it’s a necessity.

    But how do we know which coatings actually work? That’s where ASTM G31 comes in.

    What is ASTM G31?

    ASTM G31 is the gold standard guide for Laboratory Immersion Corrosion Testing of Metals. Rather than a rigid, “one-size-fits-all” procedure, ASTM G31 serves as a comprehensive guide for designing tests that simulate real-world immersion conditions.

    The guide covers every critical variable that can influence how a metal reacts to its environment, including:

    • Test Conditions: Solution composition, temperature, and fluid motion.
    • Apparatus & Sampling: How specimens are supported and the volume of solution used.
    • Interpretation: Calculating corrosion rates and identifying pitfalls that could lead to misleading results.

    Why is This Test Important?

    The primary goal of ASTM G31 is to promote better correlation of results and reduce conflicting reports. Different metals and alloys respond uniquely to environmental factors. A standardized approach to recording data ensures that when a coating claims to protect a metal. Additionally, that claim is backed by rigorous, scientific observation.

    Real-World Results: CoilSafe® vs. The Gulf of Mexico

    To put these standards to the ultimate test, Coat Zone® conducted a massive field exposure evaluation on Galveston Island, Texas. Using the principles of ASTM G31, we submerged metal samples to a depth of 3 meters in the sea for a staggering 26,200 hours.

    The environment was brutal: continuous exposure to chloride ions, tidal flows, and seasonal temperature cycling.

    The Methodology

    We tested three common industrial metals: Aluminum, Galvanized Steel, and Stainless Steel. Each sample was “half-and-half”: one side was left bare, while the other was protected by CoilSafe®, an 8-micron covalent film.

    The Results

    The contrast between the coated and uncoated sections was night and day. After nearly three years of submersion, the results verified by CZI labs showed:

    ParameterCoilSafe® CoatingUncoated Metal
    CorrosionNoneSevere
    PittingNoneHeavy
    Microbial GrowthSlightSeverely Degraded
    AdhesionCovalent BondN/A

    While the uncoated sections suffered from extensive deterioration driven by chloride-driven corrosion, the CoilSafe® sections exhibited complete corrosion resistance.

    The Verdict

    The Galveston Island test proves that when it comes to extreme submersion, the right science makes all the difference. By following the rigorous guidelines of ASTM G31, Coat Zone has demonstrated that their 8-micron covalent film provides a nearly impenetrable barrier against the ocean’s most corrosive elements. Learn more here.

  • Go Beyond the Lab with ASTM G50

    Go Beyond the Lab with ASTM G50

    Why ASTM G50 Should Be the Gold Standard for Atmospheric Corrosion Testing

    When evaluating how metals and alloys will perform in real-world conditions, choosing the right test method is crucial. While accelerated laboratory tests have their place, the superior method for determining true, long-term atmospheric corrosion resistance is ASTM G50: Standard Practice for Conducting Atmospheric Corrosion Tests on Metals.

    This testing helps product manufacturers, metallurgical companies, and end users understand the wear and corrosion behavior of specified materials.

    What is ASTM G50?

    ASTM G50 is a comprehensive standard that outlines the general procedures and conditions for exposing metal panels and alloys to real-world weather and atmospheric conditions.

    • Objective: To evaluate the corrosion resistance of metals when exposed to the weather and to assess the relative corrosivity of the atmosphere at specific testing locations.
    • Methodology: It involves placing test panels in defined outdoor exposure sites to accumulate data for comparison purposes.
    • Key Consideration: Recognizing the highly variable and complex nature of the atmosphere (weather effects, industrial factors, natural elements), the standard recommends a multi-year exposure period to minimize the influence of short-term variations and provide a reliable assessment.
    • Quality Control: It mandates the use of control specimens—materials with established weathering characteristics—to ensure the test results are meaningful and comparable.

    The Real-World Relevance of ASTM G50

    The most significant advantage of ASTM G50 is its direct correlation to how a material will actually perform in service.

    • True Corrosivity Data: By exposing materials to actual rain, humidity, temperature cycles, UV light, pollution, and natural salt deposits, the test captures the synergistic effect of these variables. This provides data that is inherently more relevant than data from conditions simulated in a controlled environment.
    • Long-Term Performance: The test accounts for seasonal variability and requires multi-year exposure. The results are highly reliable for predicting a material’s long-term durability and lifespan in a specific atmospheric environment.
    • Material Selection and Site Evaluation:
      • It helps determine the most suitable metal or protective coating for products used outdoors (e.g., in construction, automotive, or infrastructure).
      • It can also be used to evaluate and compare the inherent corrosivity of different geographical locations before large-scale projects are built.

    Why ASTM G50 is Superior to ASTM B117 (Salt Spray)

    When the goal is to predict real-world atmospheric performance, ASTM G50 offers a level of fidelity that the commonly used ASTM B117, Standard Practice for Operating Salt Spray (Fog) Apparatus, cannot match.

    While ASTM B117 (often called the salt fog or salt spray test) is a valuable tool for quality control and detecting gross material defects, it is fundamentally an accelerated laboratory test with severe limitations for performance prediction.

    FeatureASTM G50 (Atmospheric Corrosion)ASTM B117 (Salt Spray/Fog)
    Test EnvironmentReal-world weather (rain, sun, temperature cycles, natural contaminants).Controlled, high-humidity fog of 5% neutral salt solution at constant temperature.
    RelevanceHighly correlated with real-world, long-term outdoor performance.Seldom correlated with performance in natural environments when used as stand-alone data.
    Test DurationTypically multi-year (e.g., 1, 3, 5 years).Typically measured in hours or days (e.g., 24, 100, 1000 hours).
    PurposeEvaluates true corrosion resistance and atmospheric corrosivity.Provides relative corrosion resistance information for comparison in a given test chamber.
    LimitationHigh variability if exposure time is too short.Poor predictability for long-term outdoor use without corroborating field data.

    As the ASTM B117 significance section notes, “Prediction of performance in natural environments has seldom been correlated with salt spray results when used as stand-alone data.” Furthermore, correlation should be considered “only in cases where appropriate corroborating long-term atmospheric exposures have been conducted.”

    The ultimate “corroborating long-term atmospheric exposure” is, in essence, an ASTM G50-style test. The salt spray test simply does not replicate the complex, cyclic drying/wetting, UV exposure, and contamination effects that occur naturally. It creates a highly specific, controlled environment, which is why its results often fail to translate to the real-world performance engineers truly need to know.

    Coat Zone® and ASTM G50

    Despite completing 6,000 hours of B117 testing, we believe the G50 evaluation provides a stronger case for the efficacy of CoilSafe®, which is why we conducted an ASTM G50-style marine exposure evaluation. This evaluation included 25,000 hours of natural marine exposure on Galveston Island, one of the harshest coastal environments. Third-party reporting showed that CoilSafe® exhibited complete corrosion resistance, whereas the uncoated coil on the same rooftop showed extensive deterioration consistent with chloride-driven corrosion. Learn more about the results of this evaluation here.

    Final Thoughts

    For any material designed to withstand the elements, relying solely on an accelerated lab test such as ASTM B117 is a risk. ASTM G50 provides the necessary rigor and realism by testing materials in their actual operating environment: the open atmosphere. By adhering to its procedures—including using controls and committing to multi-year exposures—companies can gain confidence that their material’s performance data is not only fast but also accurate.

    Sources

  • Greener Data Centers Start with Better HVAC: A Low-Cost Sustainability Win

    Greener Data Centers Start with Better HVAC: A Low-Cost Sustainability Win

    The need for sustainability has never been more pressing across every industry, and the rapidly expanding digital infrastructure is no exception. As artificial intelligence (AI) continues to reshape our world, the demand for data center capacity is rising. The focus often turns to renewable energy sources and advanced cooling technologies. Still, a fundamental and often overlooked area for significant sustainability gains lies within the very heart of data center operations: the HVAC system.

    For those tasked with overseeing data center operations, the path to a greener future doesn’t always demand a complete overhaul. Sometimes, the most impactful changes are those that optimize existing infrastructure, delivering substantial energy efficiency improvements with a low upfront investment.

    The Unseen Burden: HVAC’s Role in Data Center Energy Consumption

    Data centers are voracious consumers of energy. While servers and computational equipment are significant power draws, the cooling infrastructure, primarily the HVAC system, often accounts for a staggering 25-40% of a data center’s total energy usage [1]. This is a critical point for sustainability: improving HVAC efficiency not only reduces operational costs but also directly contributes to a smaller carbon footprint.

    The challenge intensifies as the demand for AI workloads continues to increase. These highly compute-intensive tasks generate more heat per square foot than traditional IT operations, pushing HVAC systems to their limits. Overworked and inefficient HVAC units translate directly into higher energy bills and increased greenhouse gas emissions.

    Why HVAC Optimization is a “Low-Cost Sustainability Win”

    Investing in next-generation IT hardware is a continuous cycle for data centers. However, optimizing the existing HVAC infrastructure offers a unique opportunity for substantial energy savings without requiring massive capital expenditures or disrupting critical operations. It’s about making your current systems work smarter, not necessarily harder.

    Consider these factors:

    • Existing Infrastructure Leverage: Rather than replacing entire cooling plants, optimizing current HVAC systems maximizes the lifespan and efficiency of assets already in place.
    • Rapid ROI: Solutions focused on HVAC efficiency often yield quick returns on investment through reduced energy consumption.
    • Direct Environmental Impact: Every kilowatt-hour saved on cooling directly reduces the data center’s carbon emissions. This contributes tangibly to corporate sustainability goals.
    • Enhanced Reliability: Efficient HVAC systems run under less strain, leading to fewer breakdowns, reduced maintenance, and improved reliability for critical AI and other workloads.

    Coat Zone’s Solutions: Coating Your Path to Greener Operations

    We understand that true energy efficiency in a data center begins with protecting and enhancing the performance of critical HVAC components. Our coatings are designed to target the common culprits of HVAC inefficiency, offering a practical and cost-effective pathway to greater sustainability.

    1. CoilSafe®: Restore Peak Performance for Sustainable Cooling

    Over time, HVAC coils become fouled with dirt, dust, and microscopic contaminants. This buildup acts as an insulator, severely impeding heat transfer, i.e., the primary function of the coils. As a result, your HVAC system works harder, consumes more energy, and struggles to maintain optimal temperatures, particularly under intense AI heat loads.

    CoilSafe® is an ultra-thin inorganic coating that breathes new life into your existing HVAC coils. It restores them to near-new efficiency by forming a protective, non-stick surface that prevents corrosion and makes cleaning significantly easier. By optimizing heat transfer, CoilSafe® reduces energy consumption in your cooling units, directly contributing to your data center’s sustainability objectives. Its minimal thickness ensures no airflow restriction, maintaining optimal operational integrity.

    2. CoilSafe® Plus™: Beyond Efficiency to Enhanced Indoor Air Quality

    For data centers where environmental control and indoor air quality (IAQ) are paramount, CoilSafe® Plus™ elevates the benefits of CoilSafe®. This advanced coating incorporates an antimicrobial agent that actively inhibits the growth of mold, bacteria, and viruses on coil surfaces.

    Beyond preventing bio-fouling that can impede heat transfer and increase energy use, CoilSafe® Plus™ ensures a healthier operational environment. Maintaining cleaner coils contributes to sustained HVAC energy efficiency while mitigating risks associated with airborne contaminants, a vital consideration for critical data center infrastructure.

    3. ThermalBlock™ (or ThermalBlock by Coat Zone®): Blocking Heat, Boosting Efficiency

    Much of the heat that burdens a data center’s HVAC system doesn’t originate from IT equipment, but from external sources. Rooftop HVAC units and exposed ductwork absorb significant solar radiation, forcing cooling systems to work harder to compensate. This added thermal load directly translates to wasted energy.

    ThermalBlock™ (or ThermalBlock by Coat Zone®) is an advanced thermal radiant barrier applied to the exterior surfaces of HVAC units and associated ductwork. This innovative coating blocks up to 93% of solar heat [2], significantly reducing the amount of heat absorbed by your cooling infrastructure. By reducing the external thermal load, ThermalBlock™ (or ThermalBlock by Coat Zone®) enables your HVAC systems to operate less frequently and at lower capacities, particularly during peak solar hours. This results in substantial energy savings, reduced wear and tear on equipment, and a significant step towards a truly greener data center.

    Your Path to a Greener, More Efficient Data Center

    As AI continues to expand rapidly, the demand for data centers is expected to grow. Embracing sustainability through smart, targeted HVAC optimization is not just an environmental choice; it’s a strategic business decision. By investing in solutions like CoilSafe®, CoilSafe® Plus™, and ThermalBlock™ (or ThermalBlock by Coat Zone®), data center leaders and facility managers can achieve substantial energy efficiency gains, reduce operational costs, and demonstrate a clear commitment to a sustainable future, all of which starts with better HVAC.

    Contact Coat Zone today to explore how our coatings can empower your data center to become a leader in both performance and environmental responsibility.

    References:

    [1] U.S. Department of Energy. Energy-Efficient Cooling Control Systems for Data Centers. https://www.energy.gov/eere/iedo/energy-efficient-cooling-control-systems-data-centers 

    [2] Actual performance may vary based on specific conditions and application.