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.

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.

Nelumbo is commercializing a new platform of structural materials. The company’s current focus is on developing improved heat exchangers for the HVAC market.

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.

Nidec Motor Corporation (NMC) is a manufacturer of commercial motors, industrial motors, appliance motors, and controls. They provide ECM, single and three phase motors from fractional horsepower to thousands of horsepower for HVACR and other applications.

NJR Home Services is a trusted HVAC company dedicated to providing top-notch home comfort solutions. Specializing in furnace installation, air conditioning installation, and water heater installation, they cater to various heating and cooling needs. They offer customers home comfort solutions, including equipment sales and installations; lease and purchase of solar; and Comfort Service Plans, including heating, cooling, water heating.

As a manufacturer of duct products for environmental filtration systems, Nordfab Ducting are proud to help supply clean air for workers and equipment in workplaces of all sizes and types. Their ducting is an integral part of dust, mist, and fume collection systems around the world.

Nordic Technology Group AS is an industrial technology company with three business areas sensor-, nanomaterials- and clean tech, introducing ground-breaking technology solutions in mega trend growth markets.

Nordicco A/S is a Danish company, aiming to contribute towards the acceleration to a more sustainable society. Nordicco designs and manufactures HVLS fans and associated control systems. Their solutions help private companies and public institutions with several issues: Improve their indoor climate, lower their energy consumption, reduce their CO2 emissions, and eliminate the spread of airborne pathogens, such as viruses.

Nordicco's large HVLS fans ensure superior air flow, significant energy savings and a better indoor climate in buildings all over the world, and especially in Europe. At Nordicco A/S, the develop fans between 1.5 and 7 meters in diameter - and everything in between. Their fans cover the entire palette of desires; from built-in disinfection systems to particularly challenging environments.

Noritz offers a full line of tankless water heaters and high efficiency combination boilers to meet the hot water demands of residential and commercial applications. Noritz supports its products with a national network of skilled representatives and employees who are committed to providing the finest products and services to its communities by helping consumers.

Norman S. Wright provides customers with exceptional systems knowledge to meet all project requirements. They represent HVAC manufacturers worldwide, and their product lines support the latest energy, sustainability and comfort standards.

NAIMA is a non-profit certification program for technicians in the heating, ventilation, air-conditioning, and refrigeration (HVACR) industry and the only test supported by the entire industry.

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.

Northern Air Mechanical offers air conditioning repairs, installs, ventilation, refrigeration, ductwork, and all other HVAC installation/repair services - both commercial and residential - to homeowners and businesses across the East Valley including San Tan Valley, Queen Creek, Mesa, Chandler, Gold Canyon, and Apache Junction.

Based out of Minnesota, USA, Northern's One Hour Heating & Air Conditioning provides solutions like Air Conditioning, Heating, Furnaces, Air Quality and other HVAC services.

NTT Training is about delivering very practical hands-on safety and trade skills to workers around the world. They deliver the most comprehensive, skills-based HVAC training programs and Hands-On Training.

Founded in 1966, Nuaire is an indoor air quality and ventilation manufacturing specialist, with multi-award-winning ventilation systems that are used in a wide range of commercial and residential applications, including hotels, houses, stadiums, museums, and healthcare services.

nVent RAYCHEM is a provider of heat-trace management systems for infrastructure, industrial, commercial and residential buildings, with operations globally. They help customers enhance productivity and reduce their costs by simplifying installation and minimize downtime during operation.

Oahu Air Conditioning Service (OACS) provides the highest quality air conditioning service to commercial customers of all sizes. They provide preventative maintenance and repair services to office buildings, hotels, condominium associations, banks, shopping centers, airports, hospitals, and various state and government buildings throughout Hawaii.

Oakley Transport is dedicated to transporting liquid food grade products in the contiguous United States and also Canada and Mexico. They are pioneers in the liquid bulk food grade transportation industry for quality service at a price sensitive value.

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.

Oceanair (Oceanair UK Ltd.) is an award-winning distributor of air conditioning and heating products. They use their wealth of industry experience to help consultants, installers and end-users achieve their objectives by developing cost effective, energy efficient solutions they trust us to deliver. They offer a complete design service for both Air to Water (A2W) and Air to Air heat pumps.

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.

Olimpia Splendid is an Italian company globally known for its design, production and marketing of products for Air Conditioning, Heating, and Air Treatment solutions.

Since 1975, OmegaFlex has been supplying quality-engineered flexible metal piping products that meet highly-engineered industrial, residential, and commercial applications. They provide flexible metal hose products, vibration absorbers, flexible gas piping, (CSST-Corrugated Stainless Steel Tubing for residential, commercial, and industrial applications); flexible piping.

One Call Heating and Cool is a Georgia-based Air Conditioning, Heating, HVAC and Air Purification systems installation and services company.

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.

Oozzio offers an one-stop-shop for HVAC supplies! Whether for appliance repair, HVAC business, or a DIY enthusiast, Oozzio has everyone covered. Discover top brands, heating, cooling systems, furnaces, mini splits, air conditioners & accessories at their stores. Their user-friendly website and powerful search tools are the most trusted source for residential & commercial HVAC equipment.

OpenTherm is a non-manufacturer-dependent system of communication between modulating HVAC appliances and room thermostats. It consists of a communication protocol and an interface specification. The OpenTherm communication protocol is primarily designed to control modulating heating appliances. The protocol is available to members of the OpenTherm Association only.