MacLellan Integrated Services provides critical process cleaning services, process equipment and robotics maintenance, production line side support, sludge and wastewater management, HVAC and mechanical services and general facility maintenance. Their work environments include automotive, aerospace, and general industrial applications.

Madison Industries is a globally-renowned mechanical engineering, HVAC equipment and industrial automation solutions firm conglomerate based out of Chicago, Illinois, USA. The conglomerate believes and strives in providing a safer and healthier world, with state-of-the-art electronics, HVAC equipment, home and building automation systems that are energy efficient and cost effective.

Magic Aire is an independent manufacturer of Heating, Ventilation, and Air Conditioning (HVAC) components, fan coils, air handlers, and unit ventilators. The company sets the industry benchmarks for on-time delivery, ease of doing business and lowest warranty rates.

The Mammoth brand has been creating a comfortable indoor climate for both industrial and commercial customers. Mammoth manufactures custom commercial products that include factory-packaged rooftop systems, pre-fabricated mechanical equipment rooms and direct replacement rooftop units. All of these different products strive to improve air quality and reduce operating costs.

Manchester Tank & Equipment Co. has been a trusted industry leader in the design and manufacture of steel and aluminum low-pressure DOT cylinders and ASME pressure vessels for the storage and transport of propane, chemicals, compressed air and other industrial applications since 1946.

Marathon Motors manufactures thousands of products including single and three phase AC, NEMA and IEC, low and medium voltage, PMDC, and radial and axial flux motors.

In 2022, the Professional Plumbing Group (PPG) joined the Marcone Group. PPG and its affiliated companies – which have a history stretching back 150 years – design, manufacture, market and distribute high-quality plumbing products and solutions.

Markel Products is a renowned provider of commercial, industrial, residential electric heating equipment, industrial ventilation, controls, industrial lighting, portable air conditioning and portable evaporative cooling solutions.

MarketAir Inc. are renowned US-based manufacturers, importers and distributors of installation components and accessories for the installation of ductless, ducted and VRF Air Conditioner systems.

Marley Cooling is a globally renowned manufacturer of fluid coolers, cooling towers, fans, cooling tower components, cooling systems, media filters and evaporative cooling technologies.

Marvair is an ISO 9001:2015 certified diversified manufacturer of self-contained heating, ventilation and air conditioning products for telecommunication buildings, school classrooms, commercial/industrial structures and for the marine industry. Marvair falls under the Airxcel banner.

Mascot Mechanical, LLC has been providing outstanding air conditioning and heating service for more than 10 years in DFW Metroplex.

MasTec Network Solutions is fully qualified and staffed to handle upgrades and maintenance on HVAC, generators, power plants and batteries. MasTec Network Solutions has performed tens of thousands of site & shelter inventories, site inspections and tower mappings.

For over 36 years Mastercool has been supplying professional quality air conditioning service tools and equipment. As one of the fastest growing companies in this market, our primary goal is to drive New Product Innovation and Technologies to make the every day work of the HVAC/R technician easier. Complete line of HVACR service and installation tools.

Matrix is the technology services company in Israel, with 10,820 employees worldwide. Since its foundation in 2001, Matrix has made more than 100 mergers and acquisitions and has executed some of the largest IT projects in Israel. The company specializes in the implementation and development of leading technologies ,software solutions and products, providing its customers with infrastructure and consulting services.

Heating and cooling products for residential and light commercial industries, including the 25.5 SEER iQ Drive air conditioner and heat pump.

McCarty Bros. Inc. has been in the business of maintaining HVAC systems in the Chicagoland area for over 70 years. They do know a thing or two about it. They have service maintenance customers who have been with us for over 50 years.

Mee Industries, Inc. is a high technology company with a proven track record of providing innovative cooling and humidification solutions using the natural power of fog. Fog is a cost effective and environmentally beneficial solution for diverse applications including data center cooling, gas turbine inlet air cooling, HVAC & industrial humidification, outdoor air conditioning, greenhouse climate control and special effects.

Meek Refrigeration Inc. is a full service company specializing in Refrigeration, HVAC, Contracting, and Sheet-Metal/Ductwork. They are experienced in commercial and residential applications and carry a commitment to service and quality workmanship.

For over 30 years, Melink has been executing clean energy solutions for clients worldwide, lowering carbon emissions while increasing building values and raising company profitability.

Merril Sheet Metal Inc. is a full-service HVAC company that has been serving Central & North Central Wisconsin since 1913. They are a family owned and operated HVAC company.

Mesaba Heating, A/C and Plumbing is the one stop shop that provides complete HVAC and plumbing services in Hibbing, MN. They endeavor to provide the best service possible to the clients.

METALFLEX has grown to become a nationwide company, serving the HVAC, plumbing, utility, industrial, food, oil and petrochemical industries, with 100% of our design, engineering, and manufacturing facilities done within the U.S.A.

At Metal Form Manufacturing Company their capabilities include the analysis, distribution and manufacturing of a wide range of Air Control, Sound Control and Evaporative Cooling Products for Commercial, Industrial, Institutional and Residential applications.

Manufacturers of the innovative Metraloop expansion joint for thermal/seismic movement, Cablesphere, SDF and VaneFlex flow conditioning connectors, Metraflex makes a variety of engineered piping products.

Metrex has designed and manufactured innovative Pressure, Thermostatic, Electric and Electro-Hydraulic Actuator valves, as well as, HVAC Water Regulating and Seawater Condenser Regulator Valves. They are the most trusted name in refrigeration and heat transfer solutions in the world.

Metro Heating & Cooling is a family owned and operated HVAC Company in St. Paul, MN. They have been providing the highest quality of air conditioning and heating repairs, installations and products to both residential and commercial customers. They are licensed, insured and bonded.

MetroTech has provided HVAC solutions leveraging a technology-enabled modern work order management system throughout the US since 1986. MetroTech Service Corporation is a privately held HVAC service company providing preventive maintenance, emergency service repairs, and HVAC design/installation services to prominent multi-site commercial and retail customers across the United States.

Miami Heating & Cooling is a full service heating and air conditioning company that specializes in fulfilling HVAC needs of both residential and commercial customers.

Micek Heating & Air LLC is a local heating and cooling specialists based in Omaha, NE. They are bonded, insured and committed to providing the best possible service to the customers.