Data Centers - The Overlooked Savings Option
The Real Cost of Data Center Energy — and What Corrosion Coatings on HVAC Coils Can Save
Data centers are among the most energy-intensive structures ever built, and cooling is the single largest controllable cost inside that energy bill after the servers themselves. As facilities scale to support AI workloads, the financial stakes tied to how efficiently — and how reliably — that cooling infrastructure runs have grown substantially. One of the most overlooked levers in that equation is corrosion protection on HVAC coils, a maintenance investment that pays back in two distinct ways: lower energy consumption and avoided equipment replacement cost.
What Data Centers Actually Spend on Energy
Energy costs at a data center scale with size, but the proportions are consistent across the industry. Data centers spend an estimated $1.9 million to $2.8 million per megawatt annually on cooling alone, according to industry cost benchmarking — making cooling one of the most actionable line items in a facility's operating budget. At less-efficient enterprise facilities, cooling can account for over 30% of total energy consumption, while the most efficient hyperscale facilities have pushed that figure down to around 7% through aggressive efficiency measures. Most sources converge on a broader industry range of 30-40% of total facility power going to cooling, with IT equipment consuming the remaining majority.
A widely used industry benchmark, Power Usage Effectiveness (PUE), captures this relationship directly: PUE is the ratio of total facility energy to the energy consumed by IT equipment alone. The global average PUE sits around 1.56, meaning the average data center uses roughly 56% more total energy than its servers alone require — almost all of that overhead is cooling and power distribution. Leading hyperscale operators have pushed PUE as low as 1.09 to 1.14 through aggressive infrastructure optimization, illustrating just how much cooling efficiency separates a well-run facility from an average one.
At the megawatt scale, this translates into serious money. A modest 5 MW enterprise facility, operating near the industry-average PUE, can expect to spend somewhere in the high six to low seven figures annually just to remove heat from its equipment. Multiply that across a hyperscale campus running hundreds of megawatts, and cooling-related electricity spend routinely reaches into the tens of millions of dollars per year.
Where Coils Fit Into That Cost
Nearly every cooling architecture used in a data center — computer room air conditioners (CRAC units), computer room air handlers (CRAH units), and the chillers that support them — relies on a coil to move heat from data-center air into a refrigerant or chilled-water loop. CRAC units use a coil connected to a direct-expansion refrigerant circuit; CRAH units pass warm air over a coil filled with chilled water supplied by a central plant. In both cases, the coil is the physical interface where heat transfer either happens efficiently or doesn't.
That makes coil condition directly load-bearing for facility-wide energy performance. When a coil is clean, uncorroded, and operating at full designed surface area, it moves heat at its rated efficiency. When corrosion, pitting, or fouling reduces that surface area or roughens it, the coil requires more airflow, more water flow, or a colder supply temperature to reject the same amount of heat — and every one of those responses costs additional energy.
How Corrosion Degrades Coil Performance in a Data Center Environment
Data center cooling coils face a somewhat different corrosion environment than typical commercial HVAC. Several mechanisms are specifically relevant:
Galvanic corrosion between the copper, aluminum, brass, and stainless components used throughout chillers, coils, and manifolds, which accelerates as coolant flow erodes protective oxide layers and thermal cycling stresses metal joints.
Coil oxidation, which damages the internal coils of CRAC units directly, restricting airflow and reducing cooling capacity.
Air-side economizer exposure. Many data centers use outside air for "free cooling" during favorable weather to cut energy use, but that outside air can carry sulfur dioxide, chloride gases, and other pollutants that accelerate corrosion on both IT hardware and HVAC coils, particularly in coastal or industrial locations. Academic research published in the Journal of Electronic Packaging has specifically documented cumulative corrosion damage to IT equipment from air-side economizer operation.
Glycol and chilled-water loop corrosion, which can produce coolant contamination that circulates through the system, causing pressure drops, pump wear, and escalating energy consumption.
The scale of the resulting performance loss is significant: fouled or corroded heat exchangers can see thermal performance drop by 20-40%, directly increasing the energy required to hit the same cooling target. Corrosion damage in chilled-water and liquid cooling systems can become measurable in as little as one to two years without proper protective treatment — a much faster timeline than most facility managers assume when they build maintenance schedules around annual or biennial inspection cycles.
Energy Savings: The First Payback
This is where the case for coil corrosion coatings becomes a direct energy-cost argument rather than just an equipment-longevity one.
A coil protected by an epoxy, phenolic, silane, or e-coat corrosion barrier maintains its designed surface area and heat-transfer characteristics for years longer than an uncoated coil in the same environment. Because coatings used in HVAC and data center applications are engineered to be extremely thin — often under 10 microns for silane systems, providing a less than a 1% impact on thermal efficiency — the coating itself does not meaningfully offset the heat-transfer benefit of keeping the coil clean and uncorroded.
The energy math follows directly from the PUE relationship described above. If corrosion-driven fouling degrades coil thermal performance by even 10-15% (well within the documented 20-40% range for advanced fouling), the cooling system has to run compressors, fans, and pumps harder to hold the same server-inlet temperature. At a facility spending $1.9-2.8 million per megawatt annually on cooling, even a modest single-digit percentage improvement in sustained coil efficiency — the kind a corrosion coating helps preserve over the equipment's life — represents tens of thousands of dollars in avoided energy spend per megawatt, per year. Scaled across a multi-megawatt facility, that compounds into a six- or seven-figure annual difference between a well-protected cooling plant and a corroding one.
This is also a savings that compounds silently. Unlike a sudden refrigerant leak, degrading coil performance from corrosion often shows up first as gradually increased energy consumption without corresponding load changes — a warning sign facility teams frequently miss until it shows up as a wider trend in the utility bill.
Replacement Cost Savings: The Second, Separate Payback
The second, and often larger, financial argument for coil coatings is entirely separate from energy: avoided capital expense from premature equipment failure.
Reactive replacement of corroded cooling infrastructure is expensive on every axis. Emergency repairs or replacements typically cost three to five times as much as the same work done as planned, preventive maintenance, according to industry reliability studies — a gap driven by expedited parts, overtime labor, and the operational disruption of an unplanned outage. In data center environments specifically, that disruption carries its own cost: unplanned downtime for critical workloads can run from $10,000 to over $40,000 per minute, depending on the scale and sensitivity of the operation, meaning even a few hours of unplanned cooling-related downtime can dwarf the cost of the coil itself.
The scale these failures can reach is not hypothetical. One major U.S. data center experienced glycol-induced copper corrosion severe enough that operators had to replace an entire piping system with stainless steel — a seven-figure emergency repair that proactive corrosion management could have prevented. While that example involved piping rather than coils specifically, it illustrates the order of magnitude these failures can reach once corrosion is allowed to progress unchecked through a cooling system built on mixed metals.
Coil-level replacement costs are smaller in isolation but recur more frequently, since coils are typically the first component to show corrosion damage. Each premature coil replacement carries not just material and labor cost but also commissioning downtime, refrigerant or glycol handling, and — in facilities with tight change-management windows — scheduling delays that can push a routine repair into a multi-week project. A corrosion coating applied proactively, either at the factory or as a retrofit, is a small fraction of any of these costs and is specifically designed to push the timeline for that first coil failure out by years.
Applying Coatings at Every Stage of Coil Life
One practical advantage of corrosion coatings as a savings strategy is that they aren't limited to new construction. Protecall provides corrosion coating solutions across the full lifecycle of a coil, which gives facility operators flexibility in how and when they capture the savings outlined above:
New coils before installation. Coils can be coated prior to being placed into service, so the protective barrier is in place from day one and the coil never operates unprotected, even during the early months when a facility may be running air-side economizers or is still being commissioned.
New coils after installation, at their location. For coils that are already mounted in CRAC or CRAH units on-site, Protecall can apply coating in place, avoiding the downtime, rigging, and commissioning delay that would come from pulling a coil for off-site treatment.
Equipment already in operation. For existing coils that have been running without protection — and may already show early signs of oxidation or fouling — Protecall offers a thorough cleaning and coating process that removes surface contamination first, then applies the protective coating, restoring closer-to-original heat-transfer performance rather than sealing existing corrosion under a new coating layer.
This range of service points matters financially because it removes the "it's too late" objection that often stalls corrosion-protection decisions. A facility does not have to wait for a capital refresh cycle or a full coil replacement to start capturing energy and lifespan savings; retrofitting existing, already-installed coils captures much of the same benefit as specifying coated coils on new equipment, just starting from whatever condition the coil is in today. For data centers weighing where to spend a limited maintenance budget, being able to treat coils at any point in their service life — new, newly installed, or already in operation — turns corrosion coating from a design-phase decision into an ongoing maintenance lever available at any time.
Putting the Two Savings Together
The financial case for coil corrosion coatings in a data center is best understood as two separate but complementary savings streams:
Energy savings — a protected coil holds its designed heat-transfer efficiency longer, avoiding the gradual rise in compressor, fan, and pump energy that accompanies fouling and pitting. At $1.9-2.8 million per megawatt in annual cooling spend, even modest efficiency preservation compounds into substantial recurring savings.
Avoided capital and downtime cost — coatings push back the timeline to coil failure, sidestepping the 3-5x cost premium of reactive replacement and, more importantly, avoiding the risk of unplanned downtime priced at $10,000-$40,000 or more per minute in a critical facility.
Both savings streams scale with facility size, so the case is strongest precisely where data center growth is concentrated: large, high-density, AI-driven facilities where cooling load, capital exposure, and downtime cost are all simultaneously at their highest. For facility operators evaluating where to spend a limited maintenance budget, coil corrosion coatings sit in a rare category: a low-cost, low-disruption intervention with a measurable return on both the energy line and the capital-expense line of the balance sheet.