AAON (AAON) Q4 2025: Basics Backlog Surges 141% as Data Center Demand Drives Capacity Focus
AAON’s Q4 revealed a business in the midst of a scale and execution transformation, with the Basics segment’s backlog up 141% to $1.3 billion and management squarely focused on converting robust data center demand into profitable growth. While near-term margins were pressured by ramp costs and supply chain friction, operational investments and backlog visibility point to a structurally stronger 2026. Investors should watch for margin leverage as Memphis and Tulsa utilization improves and as execution discipline is tested under sustained volume growth.
Summary
- Data Center Demand Outpaces Capacity: Basics segment backlog and bookings surged, highlighting a multi-year growth runway.
- Margin Expansion Hinges on Execution: Near-term margin headwinds from ramping new facilities are expected to ease as utilization rises.
- Operational Discipline in Focus for 2026: Leadership’s priority is throughput, backlog conversion, and margin recovery as investments mature.
Performance Analysis
AAON’s Q4 performance underscored a business in transition, with headline revenue growth driven by outsized demand for data center cooling solutions under the Basics brand. Basics branded sales grew 143% to $548 million for the year, with a book-to-bill of 2.4 and backlog swelling to $1.3 billion, more than doubling both sequentially and year-over-year. This surge was fueled by hyperscale and co-location data center projects, reflecting a secular shift toward custom engineered thermal management solutions.
Margin dynamics were mixed, as ramp costs from the Memphis facility and supply chain constraints in Tulsa weighed on gross margins, which contracted slightly to 25.9%. The Oklahoma segment saw double-digit sales growth but lower margins due to unabsorbed overhead, while Longview (coil products) delivered margin expansion on higher throughput, especially in high-value liquid cooling. Cash flow from operations was modestly positive for the year, with working capital and CapEx investments peaking to support backlog conversion. Debt remained elevated, but management expects improved working capital discipline and higher earnings to drive cash flow and deleveraging in 2026.
- Data Center Tailwind: Basics segment delivered 109% sales growth in Q4, with order intake and backlog supporting multi-year visibility.
- Memphis Ramp Cost Impact: Unabsorbed fixed costs and ramp inefficiencies in Memphis pressured near-term margins but are expected to reverse as utilization increases.
- Oklahoma Throughput Recovery: Tulsa volumes rebounded in early 2026, setting up for incremental margin improvement as supply chain investments take effect.
Overall, the quarter’s results highlight a business balancing aggressive growth investments with the need for operational discipline, as AAON works to convert backlog into profitable output across its expanded manufacturing footprint.
Executive Commentary
"The data center market continues to represent our most robust and dynamic growth opportunity. In 2025, Basics branded sales increased 143% to $548 million, while backlog grew 141% to $1.3 billion. Our focus is now squarely on converting this demand into sustained profitable growth through disciplined program execution and capacity readiness."
Matt Tobolsky, President and Chief Executive Officer
"Gross margin was 25.9% in the fourth quarter, down from 26.1% in the prior year period. The modest year-over-year contraction was primarily driven by unabsorbed fixed costs with our new Memphis facility. Looking ahead, utilization and productivity at the Memphis facility continued to increase, and we are positioned for these capacity gains to provide meaningful operating leverage in 2026."
Rebecca Thompson, Chief Financial Officer and Treasurer
Strategic Positioning
1. Data Center-Driven Growth Platform
Basics, AAON’s data center-focused brand, has become the company’s primary growth vector, leveraging custom engineering and thermal management expertise to win large-scale, multi-phase projects. The segment’s $1.3 billion backlog reflects not only current demand but also longer-duration contracts that provide multi-year visibility, a rarity in the typically cyclical HVAC sector. Management emphasized that this backlog is diversified across hyperscalers and co-location providers, reducing customer concentration risk and supporting a consultative, high-value approach over commodity competition.
2. Operational Scale and Manufacturing Leverage
AAON’s manufacturing footprint expanded by over 25% in the past 18 months, with Memphis and Longview facilities central to the growth strategy. The near-term margin drag from ramping Memphis is expected to flip to a tailwind as utilization increases, with management targeting further capacity unlocks from existing assets before considering additional CapEx. This approach aims to maximize return on invested capital and defer major new investments until throughput and margin leverage are demonstrably improved.
3. Execution Discipline and ERP Rollout
Leadership is prioritizing operational execution and customer delivery over aggressive system upgrades, sequencing ERP implementations to avoid disruption as backlogs and lead times remain elevated. The revised ERP rollout plan reflects a “stability-first” mindset, with Tulsa’s go-live pushed to 2027 and Redmond to late 2026, ensuring that high-volume plants can focus on throughput and backlog conversion during a period of unprecedented demand.
4. Margin Recovery and Cost Structure Optimization
Margin expansion is a central focus for 2026, with management targeting gross margin of 29% to 31% for the year. This will be driven by improved supply chain reliability, higher plant utilization, and a more favorable mix as Memphis and Tulsa ramp. SG&A as a percent of sales is expected to decline to 16%, with further leverage anticipated as scale efficiencies are realized and recent investments in people and process begin to yield returns.
5. Product Innovation and Market Share Gains
AAON continues to invest in differentiated products, such as cold climate heat pumps capable of reliable performance at extreme temperatures and advanced liquid cooling solutions for AI data centers. These innovations underpin market share gains, as evidenced by outperformance versus a weak industry backdrop and strong bookings growth, especially in national accounts and the Alpha class product line.
Key Considerations
AAON’s Q4 and full-year results highlight a company at a strategic inflection, balancing the rewards and risks of rapid scale-up in a structurally shifting HVAC and data center landscape.
Key Considerations:
- Backlog Conversion Pace: Sustained backlog growth is positive, but timely conversion into revenue and cash flow will be the key test for 2026 and beyond.
- Margin Leverage vs. Ramp Costs: Near-term margin pressure from Memphis and supply chain friction must be offset by rising utilization and operational discipline.
- Capacity Unlock Over New Build: Management’s focus on extracting more volume from existing assets before further expansion signals capital discipline but raises execution expectations.
- ERP and Systems Stability: Deliberate ERP rollout sequencing reduces operational risk but places greater importance on manual process reliability during a period of high volume.
- Customer and Product Mix: Continued diversification of data center customers and high-value product mix are critical to sustaining pricing power and differentiation.
Risks
AAON faces execution risk as it ramps new facilities and seeks to convert record backlog into profitable output. Delays in supply chain stabilization, slower-than-expected plant utilization, or margin slippage could undermine the path to targeted profitability. Customer project delays in the data center market, macroeconomic headwinds, or unforeseen ERP implementation issues could also impact results. Elevated debt and working capital needs add financial risk if cash conversion lags plan.
Forward Outlook
For Q1 2026, AAON expects:
- Accelerating production volumes in Tulsa and Memphis, with margin improvement as throughput rises.
- Product mix normalization at Longview may temper margin gains early in the year.
For full-year 2026, management guided to:
- Sales growth of 18% to 20%.
- Gross margin between 29% and 31%.
- SG&A at approximately 16% of sales, with D&A expenses of $95 to $100 million.
Management highlighted several factors that will shape the year:
- Backlog conversion and operational discipline are the top priorities, with margin progression expected to be uneven by quarter.
- Cash flow improvement and modest debt reduction are expected as working capital normalizes and earnings rise.
Takeaways
AAON’s strategic pivot to data center cooling and custom solutions has delivered a robust backlog and multi-year growth visibility, but the next phase hinges on operational discipline and margin leverage.
- Backlog Strength: The Basics brand’s $1.3 billion backlog provides demand visibility and validates the data center strategy, but conversion efficiency and project timing will drive financial outcomes.
- Margin Inflection: Near-term margin drag from ramping new capacity is expected to reverse as utilization improves, testing management’s ability to optimize cost structure and throughput.
- Execution Watchpoint: Investors should monitor backlog conversion rates, plant utilization, and cash flow as leading indicators of sustainable performance in a high-growth, capital-intensive environment.
Conclusion
AAON exits 2025 with momentum in bookings and backlog, particularly in data center cooling, but now faces the critical challenge of converting this demand into profitable, cash-generating growth. Sustained operational discipline, margin recovery, and capital efficiency will determine whether the current growth wave translates into durable shareholder value.
Industry Read-Through
AAON’s results reinforce the accelerating shift toward custom, high-value thermal management solutions in the data center sector, with multi-year demand visibility and longer project cycles becoming the new norm. The ability to scale capacity, manage complex backlogs, and deliver engineered-to-order products is now a key differentiator in HVAC and adjacent industrial markets. For peers, the quarter signals that operational leverage, supply chain resilience, and customer diversification will be decisive in capturing the next wave of infrastructure investment—not just in data centers, but across commercial and industrial end markets seeking efficiency and reliability under rising demand volatility.