- Air Comfort Corporation - provider of turnkey commercial/residential HVAC systems, process piping and industrial sheetmetal.
- Air Dynamics, Inc. - engaged in commercial, industrial, institutional, governmental, and educational projects
- American Comfort Heating and Cooling - sales, service, installation, boilers, furnaces, air conditioning, air duct cleaning.
- American Industrial Heat Transfer, Inc. - produces air-cooled (tube-fin) and liquid cooled (shell and tube) heat exchangers.
- Ameritemp Ltd. - temporary heating and cooling systems for construction, institutional, and industrial applications and special events.
- Argo Summit Supply Co. - plumbing and HVAC wholesaler serving the professional trade.
- Asset E3 - environmental/energy management company specializing in HVAC customized systems design.
- Automatic Building Controls - building, energy, and temperature control management systems in northern Illinois, southern Wisconsin, and northwestern Indiana.
- B&W Enterprises - provides high quality filters for the home or business including washable filters in aluminum and stainless steel as well as other brands.
- Builders Plumbing & Heating Supply Co. - serving professionals in IL, IN, Fl, KY, MO, and WI.
- Climate Control Systems, Inc - heating, air conditioning, and ventiliation contractor.
- Cognitek Management Systems, Inc. - technology-based company that has developed an advanced, integrated and modular control solution for lighting, HVAC, refrigeration and process automation systems.
- Coyne American Institute - offers technical training in PLCs, electrical maintenance, electronics and computer repair, HVAC repair and computer office skills.
- Edwards Engineering - specializing in alalysis, design, engineering, installation, and servicing of HVAC/R equipment for commerical and industrial applications.
- Energy Services Air Conditioning and Heating Co. - furnace, air conditioner, humidifier and air filtration systems information.
- Enviro-Safe - makers of refrigerants, oil and dye charges, and leak stop products. Also sells hoses, can taps, fittings, and other specialty items.
- Fleming Hanson Sales - manufacturers representative for the HVAC industry.
- H. A. Phillips & Co. - manufacturer of industrial refrigeration pressure vessels, modulating liquid level valves, automatic control valves, and electronic and mechanical controls. H. A. Phillips & Co. is a single source supplier and manufacturer of industrial refrigeration pressure vessels, modulating liquid level valves, automatic control valves, and electronic and mechanical controls.
- Hansen Technologies Corporation - manufactures industrial refrigeration components and valves including shut-off valves, solenoid valves, and pressure regulators.
- Henson-Robinson Company - providing services in the areas of roofing, architectural sheet metal, heating, cooling, ventilation, plumbing, mechanical and specialty sheet metal fabrication.
- Kewanee Boiler Manufacturing Co., Inc. - manufacturer of firetube boilers.
- MEI - providing refrigerated cases, fixtures, and systems engineered specifically for the floral and specialty foods retailer.
- Merchants Environmental Industries, Inc. - offers HVAC and plumbing design/build contracting for the commercial, industrial and institutional markets.
- Mid-Way Supply, Inc. - wholesale distributor with branch offices in the IL-WI-IN area.
- Motor Capacitors - manufactures dry and oil-filled capacitors for Motor-Run, UPS, HVAC and other applications.
- Multifan, Inc. - manufactures fans and controls for agricultural, industrial, and specialized ventilation needs.
- Murphy & Miller, Inc. - offering HVACR service, maintenance, and design/build installation.
- Neuco Inc. - selling controls to wholesale distributors.
- Ogden Manufacturing Co. - offers a line of process electric heat and control products.
- Project and Construction Services, Inc. - specializes in project management and mechanical engineering, including HVAC design and owner representation of many types of construction projects.
- PVT Systems, Inc - manufacturers of air duct cleaning equipment including The Duct Whip.
- Refrigeration Service Engineers Society - association whose members install, service, and repair HVAC and refrigeration systems.
- Ray's HVAC Inc. - provides installation, maintenance, and cleaning of heating and air conditioning systems, humidifiers, duct work, and hot water heaters.
- S & S Hinge Company - Third-generation manufacturer of steel, stainless, aluminum, pre-plated brass and nickel, brite-annealed stainless, and electro-galvanized steel continuous (piano) hinges from .035"/.89mm to 070"/1.78mm gauge.
- Shamrock Heating and Air Conditioning - specializing in residential work.
- Sherman Mechanical - full service commercial, industrial, and residential contractors.
- Siebe Environmental Controls - manufactures, installs, and services energy management systems and controls in buildings worldwide.
- Solidyne Corporation - manufacturer of HVAC direct digital controls (DDC) and InnSite Lodging Automation and Information System. Custom electronic digital design for OEM.
- Staefa Control System - manufacturing, installation and service of controls and building management systems.
- Standard Heating & Cooling - service and install residential, commercial, and industrial systems.
- Triumph Heating and Cooling - residental furnaces, air conditioning and air cleaners. Serving the north west suburbs. Site has details of products and special offers.
- WMA Consulting Engineers, Ltd. - provide full-service mechanical (HVAC), electrical, plumbing and fire protection engineering design services.
- WarmlyYours.com - WarmlyYours’ floor heating system is safe, energy efficient, very thin and easy to install under ceramic tile, marble, carpet, vinyl, laminate or hardwood floors. It has no moving parts & requires no maintenance. FREE sample and FREE floor plan design.
- Weil-McLain - manufacturer of boilers and water heaters.
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