Navien, the provider of condensing technology, uses innovative technology to manufacture energy efficient products that provides the ultimate comfortable living experience and a healthier environment.

Neighborly® is the world's largest home services company with more than 30 brands and 5,500 franchises collectively serving 12 million+ customers in six countries, focused on repairing, maintaining, and enhancing homes and businesses. Through Neighborly.com and the Neighborly mobile app, Neighborly connects consumers to local service providers that meet rigorous franchisor standards across 19 service categories.

Nextech's primary services include commercial HVAC services and installations for multi-site commercial customers. Nextech has 40+ regional offices strategically located nationwide and provides self-performing commercial HVAC/R service across the continental United States. They also provide commercial electrical and lighting solutions to ensure safety, energy efficiency, and reliable performance across facilities.

Nexus offers solutions in hydronic heating and chilled water cooling systems. Products range from Balancing & Control Valves, Air/Dirt Separators.

NIBCO INC. is a worldwide provider of flow control solutions for commercial, industrial, and institutional construction as well as residential and fire protection markets.

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.

Nordics™ is a trusted HVAC supplier & distributor in Ontario & Canada, providing air conditioners, heat pumps, furnaces & commercial rooftop units to contractors & businesses. With fast shipping & expert support, they deliver high-quality HVAC solutions to meet all project needs. They ensure the long-term performance of heating and cooling systems across various projects.

Noritz America Corporation, a subsidiary of Noritz Japan, has corporate offices in Fountain Valley, Calif., and Atlanta, offering a full line of tankless water heaters to meet the hot water demands of residential and commercial applications.

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.

North Shore Heating & Cooling, is an Illinois (IL) Heating, Cooling, Air Conditioning, Water Heater, Boiler, and Furnace repair, service, replacement and maintenance company, located in Glenview area. North Shore Heating & Cooling employs only the best technician for air conditioner repair, furnace repair, and water heater repair as well as all air conditioner replacement, furnace replacement, and boiler replacements.

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.

NovaFlex manufactures flexible ducting, hoses, extruded thermo-plastic ducts, adapters, PVC pipping, water and steam heaters, couplers and adapters. Designed for superior flexibility, for material handling, woodworking, welding exhaust, high temp., custom OEM applications and more.

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.

NS Aircon is the best AC, refrigerator, microwave oven, and washing machine repair and service center in Vasai, Virar, and Nallasopara regions in Mumbai. They provide 24/7 service and assistance can be presented in 1 hour at the doorstep. Their qualified engineers use their huge business knowledge to quickly identify problems and resolve them in low-end estimates.

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.

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.

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.

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.

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.

Since 1822, Oneida Royal furnaces have been engineered for home heating comfort and efficiency. Designed for performance and built to last, they are top performers in home heating with innovative design features that will deliver years of dependable heat to your home.

Onsite Contractors & Plumbing Ltd is the trusted local expert for plumbing, gas fitting, and general contracting services in London. Whether it's residential or commercial, our licensed team delivers reliable, high-quality solutions on time and on budget. From renovations to emergency repairs, they’re here when users need them most.

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.

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.

Family owned by Dave and Kathy Ignasiak, Orchard Hill Mechanical offers 25+ years of experience as a full featured residential, commercial, agricultural, and industrial mechanical contractor.