Data Center Cooling Demand Meets a Premium Valuation Reset

AAON, Inc. designs, manufactures, and sells air conditioning and heating equipment for commercial and industrial applications. The company operates through two primary segments:

• AAON (legacy business): Semi-custom and custom rooftop units, air handling units, condensing units, and geothermal/water-source heat pumps. Customers are primarily mechanical contractors, engineering firms, and building owners in North America. This business is driven by replacement demand, code-driven efficiency upgrades, and non-residential construction activity.
• BasX: Custom-engineered air handling and cooling solutions for data centers, semiconductor fabrication, pharmaceutical, and other mission-critical environments. BasX systems are typically specified early in the design process and carry high engineering content, longer lead times, and stickier customer relationships.

How AAON makes money: The company manufactures in the United States — primarily in Tulsa, Oklahoma, and Longview, Texas — and sells through a network of independent manufacturer representatives and directly to large customers. Revenue is recognized on shipment of equipment. Pricing is set per project for custom work and through catalog/list pricing with volume discounts for standard products.

Scale: With 82.45M shares outstanding at $82.21, AAON carries a market capitalization of approximately $6.8B. Trailing EPS of $1.90 implies net income of roughly $157M on 82.45M shares. The public float of 68.85M shares represents about 84% of shares outstanding, indicating a reasonably liquid float despite the company's history as a founder-influenced, Tulsa-based enterprise.

Customer concentration: The legacy business is highly diversified across thousands of mechanical contractors. BasX is more concentrated — a handful of hyperscale data center customers and semiconductor customers can drive a disproportionate share of segment revenue, which cuts both ways: large orders accelerate growth, but a single customer's capex pause can create a visible air pocket.

Near-term (next 4–8 quarters):

• Data center capacity additions. Hyperscaler and colocation capex remains elevated, and cooling is an increasing share of data center build cost as rack densities rise. BasX is directly levered to this.
• Semiconductor fab construction in the U.S. CHIPS Act-driven fab construction creates demand for specialized air handling in cleanroom environments.
• Replacement cycle in legacy commercial HVAC. Installed base aging plus refrigerant transitions and efficiency codes support steady replacement demand even if new construction slows.
• Longview ramp. Incremental capacity should allow AAON to convert backlog that the Tulsa footprint could not previously serve.

Medium-term (3–5 years):

• Mix shift toward BasX. If BasX grows faster than legacy AAON, consolidated margins should expand structurally.
• Aftermarket and service. AAON has historically under-indexed on service revenue relative to peers. Building a service and parts annuity would improve revenue durability and margin.
• International. AAON's revenue is overwhelmingly North American. Selective export growth, particularly for data center cooling, is an untapped lever.
• Automation-driven cost reduction. Longview's more automated lines should lower unit conversion costs as volumes scale.

The principal risk to the growth outlook is that data center capex is cyclical and lumpy. A pause by two or three large customers would be visible immediately in BasX orders, even if the legacy business remained stable.

Note: FY2023A–FY2025E figures are illustrative estimates calibrated to the verified trailing EPS of $1.90 and the current market cap of $6.8B; they are not company guidance.

What is driving these trends: The model assumes a modest revenue recovery after a flat FY2024, led by BasX data center shipments, with gross margin expanding roughly 450 basis points from FY2024's 29.0% trough to 33.5% by FY2027. That margin recovery is the single most important assumption in the model — it depends on Longview efficiency, favorable BasX mix, and pricing power holding. At the current price of $82.21, the stock trades at approximately 43x trailing EPS of $1.90 and roughly 31x our FY2027 EPS estimate of $2.61. If margins instead stagnate near 29–30%, FY2027 EPS would likely land closer to $2.20–$2.30, and the stock would look considerably more expensive.

Market size: The North American commercial HVAC equipment market is roughly $20–25B annually, growing in the low-to-mid single digits. The data center cooling segment is smaller in absolute dollars — we estimate $4–6B in North America — but is growing at a materially faster rate, with some forecasts pointing to double-digit CAGR through the end of the decade as AI workloads increase rack power density.

Competitive positioning: AAON competes on customization, lead time, and domestic manufacturing rather than on price. Its willingness to build semi-custom and custom equipment at scale in the U.S. is a differentiator against import-heavy competitors, particularly as customers prioritize supply chain resilience and delivery certainty for mission-critical projects. The weaknesses are scale relative to the largest players and a historically narrow service/aftermarket footprint.

Named comparables:

• Trane Technologies (TT): The scale leader in commercial HVAC with a large services annuity. Trades at a premium multiple and competes with AAON in applied and custom equipment, though Trane's service mix and global reach are far larger.
• Carrier Global (CARR): Broad HVAC and refrigeration portfolio, undergoing portfolio reshaping. Competes across commercial equipment but with a different geographic and product mix.
• Lennox International (LII): Strong in commercial rooftop units — the closest direct competitor to AAON's legacy business — with a disciplined margin story.
• Vertiv (VRT): Not a direct HVAC competitor, but the key comparable for data center thermal management exposure. Vertiv's valuation is the market's reference point for how much investors will pay for data center cooling growth, and it trades at a premium multiple that AAON's BasX exposure partially justifies.

DCF discussion: A discounted cash flow analysis for AAON is highly sensitive to two inputs: the terminal gross margin and the growth rate of BasX. Using a weighted average cost of capital of roughly 9.5–10.5% (reflecting the 1.41 beta, a risk-free rate in the 4% range, and an equity risk premium of 5–6%), and assuming revenue grows from approximately $1.2B to $1.6B by FY2027 with operating margins reaching 21%, the model generates a fair value range of roughly $75–$105 per share. The wide range is driven almost entirely by the terminal margin assumption: a 200 basis point difference in steady-state operating margin moves fair value by roughly $15–$20 per share. At $82.21, the stock sits in the lower-middle of that range.

Comparable company multiples:

AAON's premium to Trane, Carrier, and Lennox reflects its faster data center growth and smaller base, but the gap versus Vertiv — the purest data center comp — suggests the market is no longer willing to pay a full data center multiple for AAON's blended business. That is the crux of the valuation debate: AAON is neither a pure-play data center name nor a slow-growth HVAC incumbent, and it is currently priced somewhere in between.

• Data center capex cyclicality. BasX revenue is concentrated in a small number of large customers whose capital budgets can shift quickly. A slowdown in hyperscaler or colocation spending would hit BasX orders before it showed up in legacy AAON results.
• Margin execution at Longview. New manufacturing facilities frequently run below expected efficiency during ramp. If Longview's startup costs persist or automation underdelivers, the gross margin recovery underpinning our estimates would not materialize.
• Raw material and tariff exposure. AAON manufactures domestically, which insulates it from some import dynamics but exposes it to steel, copper, and aluminum prices as well as tariffs on components. Input cost inflation that cannot be passed through compresses gross margin.
• Competitive response from larger players. Trane, Carrier, and Lennox have far greater scale and service networks. If they target the custom and data center cooling niches more aggressively, AAON's pricing power could erode.
• Valuation and volatility risk. At roughly 43x trailing earnings with a beta of 1.41 and a 52-week range of $73.19–$150.46, the stock has demonstrated it can lose nearly half its value on sentiment shifts alone. Elevated short interest (6.83% of float) amplifies moves in both directions.