Established in 1914, MSA Safety Incorporated is the global pioneer in the development, manufacture, and supply of safety products that protect people and facility infrastructures. Many MSA products integrate a combination of electronics, mechanical systems, and advanced materials to protect users against hazardous or life-threatening situations.

MSI Mechanical Systems Inc. is a full-service mechanical contractor and facilities service provider for commercial, industrial & retail projects. Their services include commercial HVAC systems and maintenance, data centers, hot water piping, HVAC, service and maintenance, HVAC duct work, etc.

story - Dave Tremain, founder, started designing and manufacturing pumps in 1965 under the name, MH Tool Company. In 1972, Dave added the ‘T’ for his last name, Tremain, and the business became incorporated as MTH Tool Company, Inc.

Mueller Refrigeration is a pioneer in the design and manufacturing of premium-performance valves, protection devices, and brass fittings for various OEM customers in the commercial HVAC/R industry.

Multi-Wing America specializes in designing custom engine cooling fans, radiator fans, HVAC fans, and refrigeration fans in the U.S., Canada and Mexico. Multi-Wing America’s engineering staff can customize an axial fan solution for virtually any air-moving application.

Multicyl® cylinders are a patented brand of air over oil presses used for a variety of metalworking applications such as hole punching, notching, shearing, tube piercing, assembly and metal joining.

Munch's Supply is a wholesale distributor of Heating, Ventilation and Air Conditioning (HVAC) equipment, parts and supplies servicing the Chicago, Northwest Indiana and Michigan.

Munters manufactures products that economically control humidity and temperature, provide energy recovery, and/or utilize direct or indirect evaporative cooling for comfort, process and environmental protection.

MWSS, Inc. is a national distributor specializing in business development within the Recreational Vehicle industry. Their warehouse is located in Elkhart, IN and stocks RV Ready products manufactured by GE Appliances. They offer customers an experienced staff of Sales, Service & Delivery personnel that understand the needs and processes of RV manufacturing and how GE Appliances is helping deliver reliable appliances to those in the Recreation

N & S HVAC provides customers with the finest selection of quality plumbing, heating and HVAC products, at affordable prices.

Manufacturers of air distribution, includes underfloor products, air control includes industrial dampers, VAV air terminal units, fan coil units, silencers, duct heaters, and air handlers.

Napco-International manufactures and supplies high quality industrial grade heating elements and supporting components to the industrial markets. They provide electric heating elements and accessory products such as HVAC heating elements for electric furnaces, heat pumps, air handlers and many more.

Napoleon Heating & Cooling is a manufacturer of industry products that are built with quality components for quiet, reliable operation. Their products range from gas and hybrid furnaces, ductless and central heat pumps, air handles, in heating to central and ductless air conditioners, central and ductless heat pumps, air handler in cooling. Their products also include indoor air quality, thermostats and commercial products.

Nardco Heating and Air Conditioning was established in 1961 and has provided residential and commercial HVAC installation and maintenance services. They are best known for their installation services and focus on helping their customers install the most energy-efficient furnaces and air conditioners.

NATE is a nonprofit certification organization for heating, ventilation, air conditioning and refrigeration (HVACR) technicians. They provide service and installation certifications in: air conditioning, air distribution, air-to-air heat pumps, gas furnaces, oil furnaces, hydronics gas, hydronics oil, light commercial refrigeration, commercial refrigeration, ground source heat pump loop installer, and HVAC efficiency analyst.

The National Board of Boiler and Pressure Vessel Inspectors was created in 1919 to promote greater safety to life and property through uniformity in the construction, installation, repair, maintenance, and inspection of pressure equipment.

National Center for Construction Education and Research (NCCER) is a not-for-profit education foundation created in 1996, as The National Center for Construction Education and Research. NCCER develops standardized construction and maintenance curriculum and assessments with portable credentials.

National Comfort Institute, Inc. (NCI) is an organization that provides heating, air conditioning, plumbing and electrical contractors with a focused offering of services and tools to help them improve their businesses, differentiate themselves, grow, and become more profitable. NCI accomplishes this through membership groups and by providing unique business management, sales, marketing and technical tools, training, support and coaching.

An ANSI-accredited Standards Developing Organization, the National Electrical Manufacturers Association (NEMA) gives members a competitive edge in today's rapidly changing marketplace by expanding market opportunities, acquiring exclusive business intelligence, removing market barriers, building supply chain connections, and harnessing innovation.

The Occupational Safety and Health Act of 1970 established NIOSH as a research agency focused on the study of worker safety and health, and empowering employers and workers to create safe and healthy workplaces. NIOSH is part of the U.S. Centers for Disease Control and Prevention, in the U.S. Department of Health and Human Services. It has the mandate to assure “every man and woman in the Nation is safe and in healthy working conditions.

The National Institute of Standards and Technology (NIST) was founded in 1901 and is now part of the U.S. Department of Commerce. NIST measurements support the smallest of technologies to the largest and most complex of human-made creations, ranging from nano-scale devices so tiny that tens of thousands can fit on the end of a single human hair up to earthquake-resistant skyscrapers and global communication networks.

National Pump Company manufactures a complete line of vertical lineshaft turbine, submersible, and booster pumps for the agricultural, municipal, petroleum, and industrial-commercial markets. They are a major fluid pumping solutions provider in the global water and energy markets through collaboration and innovation.

As a trusted partner in HVAC, Refrigeration, and Hydronics components, NDL Industries is here to provide solutions that enhance efficiency, reliability, and sustainability for their projects. Starting out producing a more advanced ACR copper fitting, they now offer high-quality components spanning 14 different product categories.

Neal's Heating & Air is a family-owned company that services all types of residential and commercial comfort systems. It has continued to offer custom design layouts, installation, and service of all makes and models.

Trust Nelke Mechanical Heating & Cooling with any HVAC system and customers will never encounter a bunch of grouchy contractors just trying to make a buck. Their company is backed by over a decade of HVAC experience, and they’re the best at what they do. Committed to the comfort and safety of their customers, the company's mission is to provide superior, speedy, affordable, and responsive HVAC expertise.

Neoperl is a manufacturer of faucet aerators, check valve cartridges, insert flow regulators, faucet attachments, laminar devices, sprays and adapters.

New Balance A/C Inc. provides residential and commercial heating and air conditioning repair, replacement, design, and installation services.

New Comfort Heating and Cooling provide residents and businesses in Brookville, Ohio, and the surrounding areas with quality heating and cooling system maintenance, sales, installations, and repair services.

At New Vista Heating & Air Conditioning Inc, they're a local heating & air conditioning company that's been providing top-tier heating & cooling services to Elk Grove Village, Schaumburg, and all surrounding suburbs for over 19 years.

NG Bailey is the UK’s independent engineering, rail, IT, and facilities services business with a deserved reputation for excellence. They offer integration from the outset of a project, from planning and design through the supply chain, to offsite manufacture, installation, and maintenance.