The International Code Council is a member-focused association. It is dedicated to developing model codes and standards used in the design, build and compliance process to construct safe, sustainable, affordable and resilient structures. The I-Codes are a complete set of comprehensive, coordinated building safety and fire prevention codes.

The ICRA is an association dedicated to promoting good standards of quality remanufacturing, ethical business practice and in providing education and training to its members for their benefit and to the air-conditioning and refrigeration service industry at large.

International Facility Management Association (IFMA) is the world's largest and most widely recognized international association for facility management professionals, supporting over 23,000 members in more than 10​0 countries.

International Ground Source Heat Pump Association is an association of companies, professionals and users dedicated to promoting the science, utility and use of geothermal (ground source) heating and cooling technology.

The International Institute for Sustainable Laboratories (I2SL) is devoted to the principles of sustainable laboratories and related high-technology facilities, from design to engineering to operation. Through worldwide partnerships and the exchange of technical expertise, I2SL will encourage the development of high-tech facilities that address the rapid pace of science, medicine, research, and development in a dynamic environment.

IIAR is the world's renowned advocate for the safe, reliable and efficient use of ammonia and other natural refrigerants. IIAR members share their collective knowledge and experience to produce consensus documents that address various aspects of the natural and industrial refrigeration industry. IAR sets the standard for providing advocacy, education and the most up-to-date technical information to the ammonia and natural refrigeration community.

The International Institute of Refrigeration is the only independent intergovernmental science and technology based organization which promotes knowledge of refrigeration and associated technologies and applications on a global scale that improve quality of life in a cost effective and environmentally sustainable manner.

ITI supports apprenticeship and advanced career training for union workers in the sheet metal industry throughout the United States and Canada. Located in Fairfax, Virginia, the ITI produces a standardized curriculum supported by a wide variety of training materials free of charge to apprentices and journey-level workers who work in the following specialized disciplines: Architectural Sheet Metal, Building Information Modeling,& HVAC Service.

JayKay Sales Company is an HVAC manufacturer's representative agency dedicated to providing professional, competent, and courteous sales and service support to customers of the high-quality manufacturers we represent.

Koch Air, LLC has been a privately owned, full service distributor of Carrier, Bryant, and Payne residential and commercial HVAC equipment, parts, supplies and tools. Other lines include Totaline, Honeyell, Aprilaire, NuCalgon, Modine, Takagi, Slant/Fin, and many more.

Maitz Home Services is listed as an essential business and are OPEN. They take extraordinary precautions to assure the safety of the employees and the clients.

The Mechanical Contractors Association of America (MCAA) serves the unique needs of approximately 2,600 firms involved in heating, air conditioning, refrigeration, plumbing, piping, and mechanical service.

MSCA is a renowned organization for HVACR contractors, providing education, marketing, and labor/management services to assure its contractor members deliver quality performance, value and expertise for all building system needs.

Mitsubishi Heavy Industries, Ltd. delivers innovative and integrated solutions across a wide range of industries from commercial aviation and transportation to power plants and gas turbines, and from machinery and infrastructure to integrated defense and space systems.

MJM Associates is a multi-line field sales and marketing agency representing quality HVAC/R manufacturers throughout the Rocky Mountain States.

Mulcahy Company is a manufacturer representative principally serving the heating, air conditioning, and plumbing industries. Mulcahy represents companies who manufacture a variety of products required by these industries, such as centrifugal pumps, boilers, cooling towers, filtration systems, heat exchangers, tanks, piping systems, valves, instruments, motor control devices, solar energy and much more.

NATE is a nonprofit certification organization for heating, ventilation, air conditioning and refrigeration (HVACR) technicians. They provide service and installation certifications in: air conditioning, air distribution, air-to-air heat pumps, gas furnaces, oil furnaces, hydronics gas, hydronics oil, light commercial refrigeration, commercial refrigeration, ground source heat pump loop installer, and HVAC efficiency analyst.

NADCA is an international association of over 1,200 companies that provide HVAC inspection, maintenance (i.e., cleaning) and restoration services. NADCA offers standards, specifications, specialized training and certification for industry professionals.

NAEIR is a national nonprofit organization that takes in donations of excess inventory and redistributes those goods to schools and nonprofit organization.

National Center for Construction Education and Research (NCCER) is a not-for-profit education foundation created in 1996, as The National Center for Construction Education and Research. NCCER develops standardized construction and maintenance curriculum and assessments with portable credentials.

An ANSI-accredited Standards Developing Organization, the National Electrical Manufacturers Association (NEMA) gives members a competitive edge in today's rapidly changing marketplace by expanding market opportunities, acquiring exclusive business intelligence, removing market barriers, building supply chain connections, and harnessing innovation.

The National Environmental Balancing Bureau (NEBB) is the premier international association of Certified Firms that perform Building Systems Commissioning, Building Envelope Testing, Cleanroom Performance Testing, Fume Hood Testing, Retro-Commissioning and much more!

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.

The National Institute of Standards and Technology (NIST) was founded in 1901 and is now part of the U.S. Department of Commerce. NIST measurements support the smallest of technologies to the largest and most complex of human-made creations, ranging from nano-scale devices so tiny that tens of thousands can fit on the end of a single human hair up to earthquake-resistant skyscrapers and global communication networks.

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.

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.

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.

The North American Sustainable Refrigeration Council is shaping a more sustainable, climate-friendly future for supermarket refrigeration. The technology, best practices, and manpower exist to greatly reduce the impact that supermarket refrigeration has on the environment, but right now lots of hurdles stand in the way. NASRC is an environmental nonprofit committed to taking action to address those hurdles and educating its members and public.

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.

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.