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.

National Refrigerants, Inc. (NRI) is an independent worldwide distributor of refrigerants and all associated refrigerant management services. They provide refrigerant recovery, reclamation, recovery equipment, refrigerant and oil analysis, packaged and bulk refrigerant and alternatives, refrigerant banking, cylinder refurbishment/recertification.

NB Heating & Air Conditioning installs, maintains and repairs residential and light commercial Heating – oil, gas, electric, boiler, and radiant Air conditioning – electric, heat pump and gas Air quality systems – filtration, UV, whole house solutions We provide services throughout Central and Northern Virginia.

Nester Heating and Air Conditioning is a full-service Heating, Ventilation, and Air Conditioning (HVAC) services contractor operating in San Diego County and neighboring areas. It provides commercial and residential heating and cooling services, which include: installation, troubleshooting, repair, maintenance, tune-ups, as well as pull-out and safe dismantling of damaged or old heating and cooling units.

NetX's mission is to deliver user-friendly HVAC solutions with powerful time and energy savings features to their institutional, commercial, and industrial customers.

California-based Newair Appliances is a manufacturer and distributor of luxury compact home appliances, including everything from beverage and wine coolers, ice makers, humidors, and portable heating and air conditioners.

Norris Heating and Air Conditioning is a family owned and operated business with 20 years experience in the heating and cooling industry. They have always been committed to providing you with the best in indoor comfort and air quality at the best price.

Nortek Air Solutions offers the application expertise, technological innovation, and world-class support of the group of custom heating, ventilation, and air conditioning (HVAC) brands in North America. they extensive family of brands represents a combined total of more than 390 years of experience, five manufacturing locations, and 165 sales representative offices to help find the perfect solution for your HVAC application.

Northeast Technical Institute prepares people throughout Maine with new and marketable trade skills, allowing them easy access to exciting careers. Their real-world training equips with the job skills and national certification that the employers are seeking. They provide HVAC training, technical school, vocational school, commercial driving, and certifications.

NovelAire provides innovative indoor air quality solutions to Original Equipment Manufacturers (OEMs) serving the residential, commercial and industrial markets of the Heating, Ventilation and Air Conditioning industry. Serving hundreds of OEM accounts worldwide, NovelAire has attained a reputation for innovation, flexibility, and superior product quality and customer service.

NOW Specialties, Inc. is the exterior wall system designer, fabricator, and installer in Texas. NOW was the first ACM fabricator, and is still the only MCA Premium Fabricator in Texas. They provide fabrication solutions for the installation of barrier systems, rainscreen systems, louvers and much more.

Nuvolo is the pioneer in modern, cloud-based Connected Workplace solutions. They provide a single platform to manage all people, all physical locations, all assets, and all work – enabling data sharing across departments.

Nyle Systems is a manufacturer of commercial energy-efficient heat pump water heating systems.

O.T. Hall & Son has been successfully promoting electrical, lighting, heating and networking products since 1920. They are family-owned and operated and service Maryland, DC, Virginia, Delaware and the panhandle of West Virginia.

Oakes Energy Services Ltd (Oakes Energy) designs and installs both commercial and domestic renewable energy systems. In turn, dramatically reducing the cost of energy consumption and enabling the business or home to save thousands of pounds on their energy bills. Oakes Energy Services Limited was established in 2007 with the aim of offering customers an alternative, more sustainable approach to their energy needs.

Oakwood Homes, a Berkshire Hathaway company, has always built, sourced and stayed true to what's local. By leveraging resources and partners right here at home, they can deliver true luxury in homes at every price point - for people in every stage of life.

With the Occupational Safety and Health Act of 1970, Congress created the Occupational Safety and Health Administration (OSHA) to ensure safe and healthful working conditions for workers by setting and enforcing standards and by providing training, outreach, education and assistance. The OSH Act covers most private sector employers and their workers, in addition to some public sector employers and workers in the 50 states and certain territories.

Ohio Heating and Refrigeration (OHR) provides commercial and residential HVAC, boilers, building automation, commercial refrigeration, fabrication, and food service equipment.

For more than half a century, OJ Electronics have been designing and developing electronic controls for electric underfloor heating and HVAC Controls & Drives. They give access to deep application knowledge and innovative power and help differentiate themselves in the market. They are here to help build their customers’ business.

Okto International, a HVAC provider has been working with the mission is to operate their company under Christ-like principles & standards; with integrity, honor; and work ethic. They are a highly respected service provider in the areas of Heating and Air-Conditioning all over Houston with installation, repair and maintenance.

One Hour Heating & Air Conditioning® of Lee's Summit is the most trusted source of HVAC services in the Lee’s Summit area. Their team of Lee's Summit heating and cooling technicians are highly trained and licensed, so that they can provide the best Lee’s Summit HVAC repairs, installation, and maintenance possible.

Optimum Energy’s patented software and engineering expertise has helped customers reduce energy use in heating and cooling systems, the largest consumer of energy in buildings, by up to 50%. Their solutions combine technologically advanced HVAC optimization software with powerful cloud-based data analytics and world-class engineering support.

Orival has supplied thousands of filtration units for a wide variety of customers, including Fortune 500 companies, farms, local municipalities, federal government agencies, and many more. Orival automatic self-cleaning filters are proven effective in filtration or recirculating and once through cooling water and chilled water in HVAC systems.

As a full service Air Conditioning, Heating and Ventilation company, OSBORN AC and Heat has been delivering high standard HVAC services.

Pacifica Home Services Ltd. provide a wide range of HVAC and home improvement services in the region of Houghton Le Spring, in Sunderland, in the United Kingdom.

At Parasense, they provide food retail, military, nuclear and industrial sectors with innovative and cost effective refrigerant management, energy management, systems integration and performance management solutions.

Paschal Heat, Air & Geothermal, the team of trained and certified HVAC technicians in Northwest provides timely, friendly support, and they guarantee 100% satisfaction from start to completion.

PHIUS (Passive House Institute US, Inc.) is an organization committed to making high-performance passive building the mainstream market standard. PHIUS+ buildings provide superior indoor air quality, resilience during power outages, and an extremely quiet, comfortable indoor environment.

Paul's Heating, Cooling, and Duct Cleaning and team of technical specialists are specialized in the installation and service of all major brands of quality heating and air conditioning equipment for both residential and light commercial use.

PCI Industries Inc. dba Pottorff manages two distinct divisions. One is a renowned manufacturer of damper, louver, silencer, and architectural sun control products. These products are sold through exclusive representatives across North America under the brands above. And the other division is Air Product Sales, a representative and primary supplier of commercial HVAC products servicing Southern CalifornAir control a