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AAON

An American manufacturer of semi-custom heating, ventilation, and air-conditioning equipment for commercial and industrial buildings.

Last updated August 25, 2026

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Overview

AAON is an American HVAC equipment manufacturer serving commercial and industrial indoor environments. Headquartered in Tulsa, Oklahoma, the company designs and manufactures equipment used for heating, cooling, ventilation, air movement, air handling, and related building-control applications. Its business is focused on professional and engineered HVAC markets rather than mass-market residential air-conditioning retail. The company was founded in 1988 by Norman H. Asbjornson, who created AAON after acquiring the heating and air-conditioning division of John Zink. From its beginning, the company pursued a semi-custom manufacturing model. That approach allows equipment to be configured around the capacity, layout, environmental conditions, controls, and operating requirements of a particular commercial or industrial facility. AAON's product scope includes rooftop units, air-handling units, condensing units, heat pumps, coils, and other equipment used in integrated HVAC systems. AAON expanded its manufacturing base through both organic development and acquisitions. It began manufacturing in Longview, Texas, in 2000. The company later acquired Coils Plus in Longview, initially adding coil-manufacturing capability. In 2018, it acquired WattMaster Controls, a Missouri-based controls business, broadening its involvement in HVAC control systems. In 2021, AAON acquired BASX Solutions in Oregon. BASX specializes in highly customized HVAC equipment for applications including data centers, clean rooms, and other technically demanding environments. AAON's manufacturing footprint includes facilities associated with Tulsa, Longview, Texas, Parkville, Missouri, and Redmond, Oregon. Its Longview operations have undergone substantial expansion, including a new building completed as part of a broader investment program and a further expansion approved in 2023. These investments reflect the company's effort to increase production capacity for large, configured commercial HVAC systems. The brand's competitive positioning centers on engineered performance, configuration flexibility, product integration, and energy-conscious building operation. Its customers and users include commercial property owners, industrial operators, contractors, consulting engineers, mechanical-system designers, and other professional HVAC buyers. Equipment may be sold and specified through direct commercial relationships, representatives, distributors, and project-based professional channels. Because installations are commonly designed for particular buildings, AAON's products are typically evaluated on lifecycle performance, controls, serviceability, capacity, indoor-environment requirements, and compatibility with other building systems. AAON is publicly traded on Nasdaq under the ticker symbol AAON. The company remains an active manufacturer with a portfolio spanning conventional commercial HVAC applications and specialized environments such as data centers and clean rooms. Precise current geographic sales exposure, executive assignments, and product-level launch dates are not established by the supplied reference material.

History

AAON was established in 1988 by Norman H. Asbjornson. Its formation followed Asbjornson's purchase of the heating and air-conditioning division of John Zink, after which he organized a new commercial HVAC company under the AAON name. The name was reportedly selected in part to place the company near the beginning of telephone-directory listings. From the outset, AAON concentrated on commercial HVAC equipment rather than residential consumer appliances. Its manufacturing model emphasized semi-custom equipment: products could be configured for different building sizes, capacities, air-distribution arrangements, climate conditions, controls, and installation requirements. This orientation placed the company in a project-driven market in which equipment is commonly specified by contractors, engineers, and building operators. AAON developed a product portfolio covering several major parts of commercial HVAC systems. These products include rooftop units, air-handling equipment, condensing units, heat pumps, and coils. The company also expanded into controls and specialized applications. Its equipment is used in commercial and industrial indoor environments, where system reliability, maintainability, energy use, ventilation, temperature control, and indoor-air requirements are important considerations. A significant manufacturing milestone occurred in 2000, when AAON began producing equipment in Longview, Texas. The Longview presence was strengthened by the acquisition of Coils Plus in 1991. Coils Plus initially focused on HVAC coil manufacturing, giving AAON an additional capability within the equipment supply chain. Longview subsequently became a major location for production and facility investment. AAON continued to broaden its technical and geographic capabilities through acquisitions. In 2018, the company acquired WattMaster Controls, a Missouri-based business involved in HVAC controls, and entered a lease for the facility previously occupied by WattMaster. The transaction extended AAON's product scope beyond physical heating and cooling equipment toward control and system-management functions. In 2021, AAON acquired BASX Solutions, an Oregon-based manufacturer of premium and highly customized commercial HVAC equipment. BASX's applications include data centers, clean rooms, and other specialized environments requiring tightly controlled conditions and unusual equipment configurations. The acquisition strengthened AAON's position in technically demanding niche markets alongside its established commercial-building business. AAON also invested in manufacturing capacity. In 2019, it broke ground on an expansion at the Longview plant. A 220,000-square-foot building was completed as part of the Longview development program, and the expansion was associated with a further investment in the site. In 2023, the Longview Economic Development Corporation approved another expansion, scheduled for completion in 2024. These projects indicate a continuing effort to support production of large and configured HVAC systems. The company is headquartered in Tulsa, Oklahoma, and has manufacturing facilities or operating locations associated with Longview, Texas; Parkville, Missouri; and Redmond, Oregon. AAON is listed on Nasdaq under the ticker AAON. Its current business combines conventional commercial HVAC manufacturing with controls, coils, and specialized systems for environments such as data centers and clean rooms. The supplied sources do not provide a complete chronology of leadership changes, detailed international market coverage, product-generation dates, or all financial periods.

  • 2023

    Further Longview expansion approved

    [1]

    The Longview Economic Development Corporation approves an additional expansion connected with AAON's manufacturing operations, scheduled for completion in 2024.

  • 2021

    BASX Solutions acquisition

    [1]

    AAON acquires BASX Solutions, adding specialized and highly customized HVAC capabilities for data centers, clean rooms, and related applications.

  • 2019

    Longview expansion begins

    [1]

    AAON breaks ground on an expansion of its Longview manufacturing operations and later completes a 220,000-square-foot building associated with the program.

  • 2018

    WattMaster Controls acquisition

    [1]

    AAON acquires WattMaster Controls and leases the Missouri facility previously used by the controls company.

  • 2000

    Longview manufacturing begins

    [1]

    AAON begins manufacturing equipment in Longview, Texas, expanding its production footprint beyond Oklahoma.

  • 1991

    Acquisition of Coils Plus

    [1]

    AAON acquires Coils Plus in Longview, Texas, initially adding a business focused on HVAC coil manufacturing.

  • 1988

    AAON is founded

    [1]

    Norman H. Asbjornson establishes AAON after acquiring the heating and air-conditioning division of John Zink, creating a company focused on commercial HVAC equipment.

Products and positioning

A professional commercial and industrial HVAC manufacturer emphasizing semi-custom engineering, configuration flexibility, specialized applications, and energy-conscious system performance.

  • Commercial HVAC equipment

    Rooftop units

    Commercial rooftop HVAC units are installed on building roofs or other outdoor locations and combine functions such as heating, cooling, ventilation, and air treatment in a packaged system. AAON positions this category around semi-custom configuration, allowing equipment to be matched to a building's capacity, layout, climate, controls, and operating requirements. These units are intended for professional commercial and industrial applications rather than ordinary residential use.

  • Air-management equipment

    Air-handling units

    Air-handling units condition and distribute air through a building's mechanical system. Depending on the project, an air handler may be integrated with heating and cooling equipment, filtration, ventilation, humidity management, and building controls. AAON's air-handling business serves commercial and industrial facilities in which airflow, indoor environmental quality, capacity, and equipment configuration must be adapted to the application.

  • Commercial refrigeration and cooling equipment

    Condensing units

    Condensing units provide the outdoor condensing and heat-rejection portion of refrigeration and air-conditioning systems. They can be paired with other air-side or indoor equipment to create a complete cooling installation. In commercial projects, selection depends on required capacity, refrigerant-system design, climate, controls, service access, and compatibility with the rest of the building's HVAC architecture.

  • Heating and cooling equipment

    Heat pumps

    AAON heat-pump equipment uses a reversible refrigeration cycle to provide heating and cooling for commercial or industrial buildings. Heat pumps can support year-round temperature management and may be configured as part of broader packaged or central HVAC systems. Their selection is influenced by building load, outdoor conditions, controls, ventilation requirements, and the desired balance between operating efficiency and system capacity.

  • HVAC components

    HVAC coils

    HVAC coils transfer heat between air and a fluid or refrigerant within heating, cooling, and air-handling systems. AAON's connection with coil manufacturing dates to its 1991 acquisition of Coils Plus in Longview, Texas. Coils may be incorporated into larger AAON systems or used as components in engineered commercial air-side and refrigeration applications.

  • HVAC controls · 2018

    WattMaster controls

    WattMaster Controls became part of AAON through the 2018 acquisition of the Missouri-based controls business. HVAC controls coordinate equipment operation, temperature management, airflow, scheduling, and other system functions. The acquisition broadened AAON's offering from mechanical equipment toward controls that can support more integrated commercial HVAC installations.

  • Specialized commercial HVAC equipment · 2021

    BASX specialized HVAC systems

    BASX Solutions, acquired by AAON in 2021, designs and manufactures premium, highly customized HVAC equipment for specialized environments. Its applications include data centers, clean rooms, and other facilities requiring precise environmental control or unusual equipment configurations. The business extends AAON's reach into technically demanding projects beyond standard commercial-building applications.

Brand decisions

  • 2023

    Approve another Longview expansionStrategy

    Background

    AAON continued to develop its Longview manufacturing footprint after earlier facility additions.

    Action taken

    The Longview Economic Development Corporation approved a further expansion connected with AAON's operations, scheduled for completion in 2024.

    Aftermath

    The approval supported continued planned growth of AAON's Longview production facilities.

  • 2021

    Acquire BASX SolutionsM&A

    Background

    AAON sought to strengthen its capabilities in highly customized HVAC applications and specialized environments.

    Action taken

    AAON acquired Oregon-based BASX Solutions, a manufacturer serving data centers, clean rooms, and other niche commercial applications.

    Aftermath

    The acquisition broadened AAON's specialized product and application portfolio.

  • 2019

    Expand Longview manufacturing capacityStrategy

    Background

    Growing demand for configured commercial HVAC equipment required additional manufacturing capacity.

    Action taken

    AAON began a Longview facility expansion and completed a 220,000-square-foot building as part of the development program.

    Aftermath

    The project increased the physical capacity available to the Longview manufacturing operation.

  • 2018

    Acquire WattMaster ControlsM&A

    Background

    AAON identified HVAC controls as a complementary area to its commercial equipment manufacturing business.

    Action taken

    AAON acquired Missouri-based WattMaster Controls and entered a lease for the facility previously occupied by the company.

    Aftermath

    The transaction expanded AAON's portfolio into controls and supported a more integrated approach to commercial HVAC systems.

  • 1991

    Acquire Coils PlusM&A

    Background

    AAON sought to expand its manufacturing capabilities within the commercial HVAC supply chain.

    Action taken

    The company acquired Coils Plus in Longview, Texas, initially retaining its focus on HVAC coil manufacturing.

    Aftermath

    The acquisition gave AAON an additional production capability and reinforced Longview as an important operating location.

Recent events

  • AAON announces acquisition of BasX Solutions[3]

    Reported:

    AAON announced an agreement to acquire all equity interests in BasX Solutions, with the transaction expected to close by year-end subject to customary conditions and approvals.

Sources3 sources

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