AAON designs and manufactures a comprehensive selection of HVAC solutions, including advanced air handling units, packaged rooftop units, split systems, and various heat pump technologies. The company provides highly configurable systems engineered for performance and efficiency, serving a wide array of industries such as healthcare, data centers, education, and manufacturing.
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Air Handling Unit Manufacturers
Last updated: February 2026
This directory lists 70 air handling unit manufacturers across the United States, from highly customized modular units for pharmaceutical cleanrooms to packaged rooftop units designed for retail spaces.
Buyers in this category are typically solving for critical environmental control, whether it's maintaining precise temperature and humidity in a museum archive, ensuring proper ventilation and filtration for indoor air quality, or efficiently conditioning large commercial buildings. This often involves intricate considerations around static pressure requirements, the optimal balance of enthalpy wheels vs. plate heat exchangers for energy recovery, and ensuring compliance with specific MERV ratings for filtration.
Manufacturers in this space can broadly be segmented. Some specialize in large-scale, built-up or modular units designed for complex commercial and industrial applications, offering deep customization and on-site assembly support. Others focus on standardized, semi-customizable packaged or rooftop units for simpler installations. A distinct group specializes in niche applications like cleanroom AHUs, pharmaceutical-grade units, or highly specific energy recovery systems, often with proprietary coil selections and advanced control logic.
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Company Directory
70 companies nationwide
Based in Orlando, FL, Addison HVAC manufactures innovative HVAC products for commercial and industrial applications. Their product line includes dedicated outdoor air systems (DOAS), rooftop units, and energy-efficient packaged systems. They specialize in providing advanced solutions for air handling and conditioning.
Advanced Coil Technology, LLC manufactures industrial heat transfer equipment, specializing in custom heavy-duty plate-fin welded heat exchangers. Since 1995, they provide durable and energy-efficient solutions including heating, cooling, and heat reclaim coils. They also produce industrial air handling units constructed to specific project requirements.
Based in Phoenix, AZ, Air 2 O manufactures custom, energy-efficient thermal management solutions for mission-critical facilities, including data centers and industrial production environments. The company specializes in sustainable low dew point HVACD applications, providing advanced air handling systems globally.
Based in Akron, OH, Air Enterprises manufactures premium, custom air handling units. With an all-aluminum panel design, their durable solutions offer ultra-low air leakage and energy efficiency. For nearly six decades, the company has provided sustainable and reliable systems for commercial, industrial, and institutional clients.
Based in North Syracuse, NY, Air Innovations manufactures specialty environmental control units and custom cleanroom HVAC systems. They provide solutions for demanding applications requiring precise temperature, humidity, and advanced filtration, including HEPA and ULPA.
Based in Greer, SC, AIRSYS Cooling Technologies Inc. manufactures mission-critical HVAC and cooling solutions. They deliver ultra-efficient systems for global digital infrastructure, including hyperscale data centers and telecommunications networks. AIRSYS also provides School Air Solutions for K-12 industries, focusing on fresh, clean indoor air quality, reliability, efficiency, and sustainability.
Baikal Mechanical manufactures custom Air Handling Units (AHUs) and provides comprehensive HVAC engineering solutions for commercial and industrial applications. The company specializes in retrofitting older commercial HVAC systems, delivering energy-efficient designs with advanced technology to ensure operational savings for clients.
Bard Manufacturing provides high-quality commercial heating, cooling, and ventilation equipment, including the new Flex Series. Engineered and built in America, they support diverse applications like schools, data centers, and industrial facilities. The company brings over a century of proven performance.
Based in Redmond, OR, BASX Solutions specializes in the design and manufacturing of custom air handling units and precision-engineered HVAC products. The company offers high-efficiency solutions for data centers, cleanroom systems, and custom DX requirements, serving various industries with tailored HVAC.
Based in Amherst, VA, Buffalo Air Handling designs and manufactures custom air handling systems. Established in 1878, the company uses advanced technologies at its cutting-edge facilities to craft durable, reliable air handling units. They provide comprehensive services from design through installation support.
Canarm Inc. is a US-based manufacturer specializing in air movement and HVAC products, including commercial, industrial, and custom-built air handling units. With a facility in Brockport, NY, they provide robust units featuring rigid welded construction and high bearing life for diverse industrial and commercial applications.
CaptiveAire Systems engineers integrated air systems, including commercial kitchen ventilation, fans, heaters, and ductwork. The company manufactures complete solutions designed for performance, comfort, and longevity, serving various commercial applications for comprehensive air management.
Based in Owatonna, MN, Climate by Design International manufactures standard and custom desiccant air handlers. They provide advanced DH Series units designed to meet diverse indoor air quality requirements for various commercial and industrial applications.
Based in Canton, MI, Clean Air Technology designs, engineers, fabricates, and installs custom cleanroom HVAC equipment. They manufacture special purpose air handling units (AHUs) for various applications. The company provides turnkey modular cleanroom solutions for pharmaceutical, aerospace, medical, defense, and biotech industries worldwide.
ClimateCraft, Inc. manufactures site-assembled replacement air handling units in Oklahoma City, OK. They offer a wide variety of design options and utilize construction materials such as galvanized, aluminum, or stainless steel to meet diverse client needs. Specializing in efficient air handler solutions, they serve commercial and industrial customers.
Custom Mechanical Systems, LLC, founded in 2008, designs and manufactures high-efficiency custom cooling systems primarily for data centers. The company specializes in bespoke solutions, providing critical infrastructure that ensures optimal performance and energy efficiency. They are a direct provider of specialized cooling equipment.
Based in Raleigh, NC, Custom Air Handling Solutions, Inc. manufactures custom engineered air handling units. Specializing in heat recovery, DX, and hydronic packages, they emphasize quality materials and value. With US manufacturing facilities in North Carolina and Michigan, the company offers expert design assistance for commercial and industrial HVAC requirements.
Based in Houston, TX, Custom Air Products and Services (CAPS) specializes in manufacturing Air Handling Units. They utilize an innovative modular framing system designed for easy equipment replacement, minimizing disruption. CAPS provides custom solutions for various commercial and industrial HVAC needs.
Based in Anaheim, CA, Air Zone International specializes in the design and manufacture of high-efficiency custom commercial air handlers. The company provides specialized air handling units for various commercial applications, focusing on custom solutions and advanced equipment.
Based in Dallas, TX, First Co. is an HVAC manufacturer specializing in innovative heating and cooling systems. The company provides engineered solutions for residential, multi-occupant, and commercial applications, including chilled water fan coils and water source heat pumps. It highlights American engineering excellence.
Based in Comstock Park, MI, Fisen Corporation designs, engineers, and manufactures custom HVAC solutions. They specialize in modified HVAC systems, offering cost-effective units like free-cooling chillers, desiccant dehumidifiers, and energy recovery modules. Their engineered solutions reduce operating costs and increase efficiency, often partnering with Johnson Controls.
Based in Fenton, MI, Flex Air is a custom modular integrator specializing in applied mechanical and electrical equipment and HVAC solutions. The company provides custom air handling units and other systems for diverse sectors, including industrial, automotive, pharmaceutical, data centers, and healthcare.
Greenheck designs and manufactures a comprehensive line of air movement, control, and conditioning equipment. Their products, including models like RT, are designed to heat, ventilate, cool, humidify, dehumidify, and filter air for commercial, industrial, and kitchen applications, ensuring reliable comfort and energy efficiency.
Based in Denver, CO, Hercules Industries manufactures and distributes high-quality HVACR equipment, which includes air handling units, alongside sheet metal products. The company also provides a range of parts, tools, and supplies. All their manufactured products are proudly American-made.
Based in Athens, TX, HVAC Manufacturing and Technology designs and manufactures intelligent HVAC products. They specialize in air handling systems, modular pre-fabrication, and biogenic ionization air purification. The company also produces UL listed electrical control panels and cutting-edge software for B2B customers.
Johnson Controls is a global technology leader providing smart building solutions. As a direct manufacturer, they offer YORK® Custom Air Handling Units, designed to adapt to unique environmental needs. These AHUs deliver perfectly balanced performance for various commercial and industrial applications throughout the United States.
Based in Evansville, IN, Koch Applied Solutions specializes in manufacturing custom air handling units. They provide tailored solutions for the most challenging situations, configuring units to fit unusual spaces and difficult installations for commercial and industrial applications.
Based in Littleton, CO, Energy Labs specializes in manufacturing custom air handling units. They produce air-cooled and evaporative-cooled rooftop DX units, alongside indirect and direct evaporative cooling solutions. The company serves commercial and industrial clients, utilizing AI and building analytics to enhance their offerings.
Based in Rancho Cordova, CA, McIntyre Industries manufactures custom HVAC solutions. They specialize in precision-engineered air handlers, heat exchangers, and chillers for both military, particularly the Navy, and commercial sectors, focusing on optimizing performance and efficiency.
Based in York, PA, Miller-Picking manufactures custom air handling units and solutions for commercial markets. With over 50 years of experience, the company provides tailored air handling systems, emphasizing quality, service, and comprehensive support. Miller-Picking operates as part of Johnson Controls.
Nordyne, based in O'Fallon, MO, is an HVAC manufacturer producing heating and cooling equipment. With over a century of experience, the company provides revolutionary HVAC systems and solutions. A member of the Rheem family, Nordyne partners with distributors and contractors to deliver reliable equipment.
RenewAire, based in Waunakee, WI, manufactures Energy Recovery Ventilators (ERVs) and Dedicated Outdoor Air Systems (DOAS). These advanced systems are designed to provide exceptional indoor air quality for commercial and residential buildings, helping to reduce energy costs by up to 70%. The company specializes in efficient air handling solutions.
Based in York, NY, Rheem Manufacturing Company specializes in the production of residential air handlers. Their units are engineered to deliver efficient airflow, quiet operation, and enhanced comfort for home heating and cooling systems, serving the residential HVAC market.
Based in Gilbert, AZ, Silent-Aire designs, engineers, and manufactures advanced air handling units (AHUs), CRAC, and CRAHU systems. The company specializes in hyperscale cooling and modular data center solutions, serving large hyperscale facilities with custom-engineered infrastructure and comprehensive field services for deployment and maintenance.
Based in Exton, PA, SysTech Design manufactures industrial air handlers, offering both off-the-shelf and custom designs for tempered air and building positive pressure. The company provides complete industrial ventilation systems, including dust collection, fans, blowers, noise control, and combustible dust explosion protection.
Based in Houston, TX, TAS specializes in the modular manufacturing of custom air handling units (AHUs). They design and construct AHUs off-site, offering pre-piped, pre-wired, and pre-controlled solutions for efficiency. TAS provides flexible and scalable modular solutions for diverse industries, ensuring quality through in-house factory inspection and testing.
Twin City Fan manufactures specialized fan solutions for the HVAC industry, industrial processes, and commercial comfort systems. They provide high-efficiency EC plenum fans designed for integration with HVAC and building controls, along with roof exhausters and OEM fan systems, focusing on durable, energy-efficient air movement.
Based in Mauston, WI, Titan Air LLLP manufactures HVAC equipment for industrial and commercial applications. They specialize in custom air handling units, direct-fired make-up air units, and industrial furnaces. Since 1983, the company has provided tailored solutions for diverse industrial and commercial sectors.
United Metal Products (UMP) manufactures custom, heavy-duty air handling units with capacities from 1,000 to 200,000 CFM. The company provides innovative cooling solutions for data centers and offers evaporative cooling and energy recovery equipment.
Based in Long Beach, CA, Westaire Engineering, Inc. designs and manufactures custom-built, modular-construction air handling units. These high-efficiency HVAC units provide integrated air transfer systems for both indoor and outdoor applications, along with Western Rotary Ventilators.
Based in Westerville, OH, Energy Labs Inc. manufactures high-performance, custom air handling systems and HVAC solutions. The company provides tailored products for complex commercial, industrial, institutional, and data center cooling projects. Specialties include custom air handling, rooftop DX units, indirect/direct evaporative cooling, and energy recovery systems.
Based in Okarche, OK, Nortek Air Solutions is a custom HVAC manufacturer. They specialize in building efficient, dependable heating and cooling systems for commercial and industrial clients. With five factory locations across the United States, the company provides comprehensive air handling unit manufacturing, design, and delivery solutions.
Based in East Syracuse, NY, TROX North America, LLC manufactures air handling units. Their X-CUBE units are individually configurable for a wide range of applications, accommodating various volume flow rates. The company provides solutions and services for air conditioning and ventilation systems in commercial and industrial settings.
Based in Escondido, CA, United Manufacturing Air Systems designs and manufactures air handling units. They offer standard and custom air handling cabinets, providing flexible solutions for diverse applications. The company also produces fin and tube heat exchangers and various HVAC coils.
Alliance Air Products specializes in the design and engineering of custom air handling equipment. The company provides practical solutions for various aspects of air handling unit manufacturing, focusing on developing tailored systems to meet specific client requirements for commercial and industrial applications.
Allied Commercial manufactures a broad selection of commercial HVAC systems, including packaged rooftop units, split systems, unit heaters, and industrial furnaces. They focus on engineering units for optimal efficiency, easy serviceability, and quick installation for commercial and industrial applications.
American Standard manufactures comprehensive heating, ventilation, and air conditioning (HVAC) solutions for residential and light commercial applications. Their product line includes furnaces, air conditioners, heat pumps, and advanced modular variable speed air handlers. These units are engineered for efficient and reliable indoor climate control, supporting a network of dealers across the United States.
Based in Orange, CA, Autumn Air, Inc. provides comprehensive sheet metal fabrication services. The company specializes in manufacturing and installing components and systems for heating and cooling equipment. Their expertise ensures precision craftsmanship for various HVAC applications, catering to industrial and commercial clients requiring specialized air handling solutions.
Based in Colville, WA, Colmac Coil Manufacturing, Inc. produces hygienic air handlers, including the washdown-ready HygenAir® A+H series for food processing and sanitary environments. The company also offers refrigeration evaporators, fluid coolers, condensers, and various heating and cooling coils for industrial applications.
Control Air provides custom design, engineering, and in-house fabrication of commercial HVAC and plumbing mechanical systems. Based in California, the company manufactures air handling units and other key components, alongside offering installation, building controls, maintenance, and ongoing service for comprehensive mechanical solutions.
Daikin Applied manufactures advanced air handler units designed for superior HVAC performance. The company focuses on enhancing indoor air quality and energy efficiency through groundbreaking R&D and precision engineering. They offer a comprehensive catalog of industry-leading solutions for commercial and industrial buildings throughout North America.
Based in Sheboygan Falls, WI, Desert Aire manufactures specialized dehumidification systems for various commercial, industrial, and recreational applications. They provide comprehensive solutions to control humidity and improve indoor air quality. Their engineered products are integral components of HVAC systems, offering advanced air handling capabilities.
EVAPCO is a global manufacturer of heat transfer products, specializing in Critical Process Air Handling Units (CPAU) designed for mission-critical applications. These units provide precise control over temperature, humidity, pressurization, and air purity. EVAPCO also produces evaporative condensers, closed circuit coolers, and cooling towers.
Based in Snoqualmie, WA, Haakon Industries designs and manufactures custom air handling units. They serve a wide array of building environments and industries, including hospitals, office buildings, universities, schools, government, industrial facilities, clean rooms, theme parks, and airports.
Based in Minneapolis, MN, Innovent designs and manufactures custom air handling equipment. With over 40 years of experience, the company provides built-to-order solutions emphasizing efficiency, durability, and dependable ventilation, including multiple fan redundancy options for continuous operation.
Mojave Energy Systems is a commercial HVAC manufacturer based in Sunnyvale, CA, specializing in advanced air handling units. They utilize innovative liquid desiccant technology in their ArctiDry product line, delivering high-efficiency cooling, superior dehumidification, and significant energy savings for demanding commercial applications, without overcooling or reheat.
Based in Madison, OH, Phoenix Air Systems manufactures custom-engineered hygienic air handling units and HVAC systems. They provide critical process air solutions designed for demanding environments like food processing, pharmaceutical, and cleanroom applications, ensuring optimal air quality and temperature control.
Price Industries manufactures air distribution, critical control, and noise control products, emphasizing research and precision engineering. They offer a range of HVAC solutions for the non-residential sector, including BMS systems, thermostats, rooftop units, terminal units, and diffusers.
Trane manufactures robust airside equipment, including air handling units, for commercial HVAC systems. Their products are engineered for long-lasting performance, focusing on ease of installation, maintenance, and serviceability across diverse building applications and operational requirements.
ADP is a US-based manufacturer of air handling units. They produce indoor modular blowers, including the MX Series, which are designed with flexible options such as electric or hot water heat models. All ADP air handlers are 100% tested to ensure quality and performance.
Carrier Commercial provides robust air handling units (AHUs) engineered for reliable heating, cooling, and ventilation. Their AERO 39L air handler features durable galvanized steel construction, double-walled doors, and ASHRAE-compliant condensate systems, serving commercial and industrial HVAC needs.
Champion Home Comfort designs and manufactures Champion brand air handling units and other HVAC products. They provide high-efficiency air handlers for residential split systems and commercial applications, distributed through a network of dealers and contractors. The company focuses on ensuring total comfort through reliable and efficient comfort solutions.
Durastar manufactures reliable, value-friendly HVAC solutions, specializing in air handlers, mini-splits, heat pumps, air conditioners, and furnaces. Their systems are engineered for consistent comfort, offering high efficiency, Low GWP, ENERGY STAR ratings, and quiet operation. Products are available through licensed contractors.
Luxaire manufactures high-efficiency air handlers for residential and light commercial HVAC systems. Their units integrate quiet, efficient blowers to boost system reliability and performance. Luxaire offers various air handler models compatible with diverse indoor coils and split systems, providing reliable climate control solutions.
Pace Air Systems, a brand under Johnson Controls, engineers and manufactures air handling systems. The company specializes in creating semi-custom units designed for specific applications, including projects with stringent acoustic requirements, serving industrial and commercial clients.
Schneider Electric manufactures integrated cooling technologies for data centers, designed to efficiently transport heat energy from IT environments. Their solutions include advanced Air Handling Units (AHUs) and other thermal management systems for commercial and industrial applications.
STULZ USA manufactures air handling units, precision air conditioning units, and chillers. They provide energy-efficient cooling solutions for reliable applications and mission-critical data centers. With over 75 years of experience, the company produces high-quality products adapted to specific customer needs and current developments.
TempMaster manufactures energy-efficient commercial HVAC equipment, including packaged units, split systems, dedicated outside air systems, and packaged rooftop units. Their offerings span 3-150 ton capacity A/C and heat pump models, emphasizing simplified installation for commercial applications.
YORK manufactures industrial air handling units to enhance HVAC system efficiency and performance for commercial, institutional, and industrial organizations. They also provide thermal management solutions like chillers and commercial heat pumps, emphasizing customer-driven innovation and global scalability.
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How to Choose a Company
- Verify the manufacturer's ability to provide accurate AHRI-certified performance data (e.g., AHRI 430 for central station air-handling units) for your specified airflow, static pressure, and coil capacities, rather than relying on extrapolated or estimated figures.
- For critical environments like hospitals or pharmaceutical facilities, insist on manufacturers who can demonstrate compliance with ASHRAE 111 (for measured leakage rates, often requiring under 1% at 1.5 times operating pressure) and offer UL 1995 or ETL listings for electrical components and overall unit safety.
- Be wary of manufacturers who provide significantly shorter lead times than competitors for custom-built units without a clear, verifiable explanation of their expedited production process, as this can often lead to rushed quality control or omitted critical components.
- Evaluate their experience with integrating advanced control protocols and DDC systems common in modern building management, specifically inquiring about their support for BACnet or LonWorks gateways and their capability to pre-program custom control sequences.
Frequently Asked Questions
How do AHRI certifications like AHRI 430 or AHRI 210/240 directly impact the performance guarantees of an AHU?
AHRI certifications provide a standardized, third-party verified rating for an AHU's performance, ensuring that the unit's stated capacity (cooling, heating, airflow) and energy efficiency metrics (like EER or COP) are accurate and comparable across different manufacturers. For example, AHRI 430 specifically covers central station air-handling units, allowing buyers to trust that fan performance, coil capacity, and sound power levels meet published data under specified test conditions, mitigating the risk of undersized or inefficient equipment.
What specific details should I focus on when specifying casing construction and material for my AHU, beyond just standard galvanized steel?
Beyond standard galvanized steel, consider factors like double-wall construction with an R-value appropriate for your climate and condensation prevention. For corrosive environments, specify stainless steel (304 or 316) or coated panels. Also, inquire about casing leakage rates, ideally requiring compliance with ASHRAE 111 standards (e.g., <1% leakage at 1.5 times design static pressure), and look for features like non-thermal-bridged panels to minimize energy loss and prevent exterior condensation.
When is investing in fan array technology for an AHU truly justified over a traditional single-fan setup?
Fan array technology, which uses multiple smaller, direct-drive fans instead of one large belt-driven fan, is often justified in applications where redundancy, energy efficiency, and precise airflow control are paramount. It offers built-in redundancy (if one fan fails, others continue to operate), often higher energy efficiency due to eliminating belt losses, and quieter operation at lower speeds. It's particularly beneficial for critical facilities like data centers, hospitals, or manufacturing plants where downtime is unacceptable and consistent, optimized performance is required, despite a higher initial capital cost.