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.

The North American Electric Reliability Corporation (NERC) is a not-for-profit international regulatory authority whose mission is to assure the reliability and security of the bulk power system in North America. NERC develops and enforces Reliability Standards; annually assesses seasonal and long‐term reliability; monitors the bulk power system through system awareness; and educates, trains, and certifies industry personnel.

Northcoast Plumbing and Heating is a reliable HVAC partner and services provider in Massachusetts, USA. They specialize in water heater replacement, commercial and residential plumbing, kitchen and bathroom plumbing, and both residential and commercial gas piping. Their expert team is dedicated to installing hot water systems and small appliances, such as gas ranges, fire pits, and BBQs, all with top-notch service and short wait times.

Northwest Mechanical is the go-to HVAC contractor in the Willamette Valley for all of the HVAC needs. They install and service HVAC, RTU's, commercial kitchen equipment, boilers, chillers, ice machines, walk-in coolers and freezers, and much more! They also have a full sheet metal fabrication shop for custom fabrication needs.

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.

NTI manufactures only top-quality hydronic heating equipment. Acknowledged as a pioneer in research and product development, NTI is a pioneer in developing the most advanced and efficient home heating equipment, including gas boilers, water heaters, combi furnances, hot water tanks and solid fuel boilers.

Nu-Calgon markets and distributes a complete line of specialty chemical products for the HVACR aftermarket. They provide water treatment, sealants, specialty and service chemicals, coil cleaners, system flush solvents, refrigeration oil, vacuum pump oil, ice machine treatment, indoor air quality.

Nu-Mun Contracting is a Calgary based plumbing company formed by Doug Muncaster in 1989. They provide sheet metal installations for commercial, industrial and residential applications. The company also offers air conditioning, residential plumbing, commercial plumbing, and other HVAC solutions.

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.

NYC HVAC Contractor provides expert residential and commercial HVAC services across New York City, USA. From AC installation and heating repair to energy-efficient system upgrades, their certified team delivers fast, reliable service with unmatched professionalism and attention to detail. They are a licensed and insured HVAC company committed to fast, efficient, and high-quality air conditioning and heating services.

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

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.

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.

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.

Oasis Heating and Air Conditioning is a heating and air conditioning company in Milwaukee, WI. They are committed to providing their customers with the most reliable customer service possible. They specialize in HVAC installation, repair, maintenance, and water heaters. Their team comprises highly trained professionals who are experts in their field and will always strive to provide customers with the best service possible.

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.

Ocean Plumbing and Air provides high-quality residential plumbing, as well as drain cleaning, sump pump, and water heater services. They are a business owned and operated in the local community by Miami Plumbing Professionals. They provide both residential and business customers with a wide variety of heating, cooling and plumbing services.

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.

Octopus Energy drives system change: with transformative tech to make renewable energy the norm and end global reliance on fossil fuels. Octopus Energy Group is made up of 10 businesses spanning 6 countries across 3 continents, including: Octopus Energy Retail, Kraken Technologies, Octopus Energy Generation, Kraken Flex, Octopus Electric Vehicles, and the Octopus Centre for Net Zero.

Ofgem is Britain’s independent energy regulator. Their role is to protect consumers now and in the future by working to deliver a greener, fairer energy system. They are a non-ministerial government department and an independent National Regulatory Authority.

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.

Oklahoma Chiller Corporation is a commercial and industrial HVAC company with offices in Tulsa and Oklahoma City. In addition to mechanical and HVAC services, Oklahoma Chiller offers building automation services and equipment rental services.

Omdia unifies and harnesses the depth and breadth of expertise from Informa Tech’s legacy research brands: Ovum, IHS Markit Technology, Tractica and Heavy Reading. They offer unparalleled, world-class research and consultancy to navigate the now and create the future.

OMNIA Partners, Public Sector is the cooperative purchasing organization that is driving excellence in public sector procurement for K–12 schools and districts, state and local governments, colleges and universities and nonprofits. OMNIA Partners offers the most robust portfolio of high-quality cooperative contracts in the public procurement space.

On Air services the South Palm Beach County areas, Broward County and North Dade County.We install and service all major and minor brand air conditioners, serving both Residential and Commercial Customers.

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.

One Source, Inc. provides complete building management services for commercial properties throughout San Diego. they work with clients in a wide variety of industries to coordinate services in every area of maintenance, from janitorial services to landscaping, high-pressure washing, carpet cleaning, window washing, junk removal, and much more.

ONICON Incorporated has been delivering market leading flow and energy measurement products since 1987. Their inventory includes hydronic insertion turbine flow meters, hydronic inline turbine flow meters, BTU meters, flow computers, vortex flow meters, electromagnetic flow meters. They have been delivering quality engineered flow and energy measurement instruments for hydronic heating and cooling systems for over 30 years.

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.