International Environmental Corporation (IEC) are manufacturers of hydronic fan coil systems for hospitality, multi-family, healthcare, and education. They also offer replacement and retrofit solutions for fan coils in applications where limiting downtime is crucial to a business’ success.

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.

iPHA is a global network of Passive House stakeholders including architects, planners, scientists, suppliers, manufacturers, policymakers, contractors, property developers, and more! Its membership network encourages the exchange of Passive House knowledge, providing members with a range of benefits and advocating for Passive House in policy, the media, and amongst the general public, and the entire range of construction professionals.

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.

International WELL Building Institute (IWBI) is the global authority for transforming health and well-being in buildings, organizations, and communities around the world. IWBI's mission is to lead the global movement for putting people first in business decision-making and culture.

The International WELL Building Institute (IWBI) is the movement to promote health and wellness in buildings and communities everywhere. IWBI delivers the WELL Building StandardTM, and a professional suite of tools to empower the global community. They believe that buildings should be developed with people's health and wellness at the center of the design.

Interplay Learning is a software company with a mission to deliver scalable and effective trades training. Interplay Learning creates modules and training for multiple industries including HVAC.

Intertek is a quality solutions provider to industries worldwide. From auditing and inspection to testing, training, advisory, quality assurance, and certification, the company adds value to its customers by helping improve the quality and safety of its products, assets, and processes. Intertek caters to various industries including chemicals, retail, transportation, life safety and security, energy and commodities, energy, and more.

Since 1919, Intertherm has been an integral part of improving the comfort of manufactured homes. They are the only heating and cooling manufacturer to be certified in Demand Flow Technology.

INTOHEAT Ltd is a Mechanical & Electrical building services company based in Bristol and Exeter, operating nationally. Their efficient, personal and friendly service ensures every project is managed to the highest standards in terms of estimating, planning, design, installation and ongoing maintenance.

InviAir is a manufacturer of wall and ceiling air diffusers and grilles for HVAC systems. The innovative, flush-mount process allows products to blend discreetly into the interior architecture unlike anything else on the market. Founded by HVAC professionals with over forty years of experience in the industry, InviAir is dedicated to offering some of the best air diffusers and grilles worldwide.

Established to serve wholesale distribution, iO HVAC Controls offers unique products from multiple sources for a variety of applications. From wireless relays to fresh air ventilation controls, the company's solutions are designed to be easy to install, cost-effective and profitable.

ION Enterprises manufacturers a range of environmental water treatment devices under the trademark ION ScaleBuster. Ion provides an innovative approach to water conditioning. ION ScaleBuster is a proven water conditioning technology for general pipework, heating and plumbing equipment, appliances and processing equipment.

IonicBlue® is a joint venture between Johnson Controls, the global pioneer in delivering energy and infrastructure solutions, and Apollo Global Management a leading, global alternative asset manager. They deliver a total solutions approach through the expertise of Johnson Controls and the unmatched ability of Apollo to provide alternative capital solutions.

Iowa Precision Industries is a leader in automated HVAC coil lines, duct fabrication systems, seam closers and corner inserters – a company with a rich history that has the experience and proven know-how to develop systems meeting the specific production goals of customers – worldwide. The Fabriduct(R), ProFabriduct(R), Ductomatic, Cornermatic(R), Whisperloc(R), and Elbowmatic machines are the industry’s finest products.

At Ipsos believe the clients need more than a data supplier, need a partner who can produce accurate and relevant information and turn it into actionable truth. This is why passionately curious experts not only provide the most precise measurement but shape it to provide a True Understanding of Society, Markets, and People.

Irr Supply Centers, Inc. is a renowned distributor of Plumbing, Heating, Cooling, Electrical, and Refrigeration products serving a wide range of customers throughout Western/Central New York and Northern Pennsylvania.

IDC has several designers on staff, each holding various certifications with The Irrigation Association in drip/micro systems, sprinkler systems, and surface irrigation methods. They provide air vents, pumps, pressure regulators, filters, valves, and much more.

At IRSAP Spa, they are a leading company in Italy and Europe in the heating sector. Production of tubular steel radiators. Main company of a leading group also in the production of air conditioning systems, chillers, refrigeration machines for civil and industrial use, as well as radiant air conditioning systems.

Isaac Heating & Air Conditioning is one of the largest privately-owned HVAC contractors in the United States. They offer residential and commercial installation and servicing of heating and air conditioning equipment. Their products inventory includes boilers, air conditioners, heat pumps, humidifiers, dehumidifiers, thermostats and water heaters.

ISAB Group offers services in energy, ventilation and pipe lining. They are located in Gothenburg, Halmstad and the Malmö region.

Industrial distributors focus on product knowledge and expertise while bringing the customer a massive line of name-brand, quality products.

ISC Sales Inc. provides superior industrial products to a wide variety of end-users and original equipment manufacturers (OEM). They offer a broad range of climate control products for electrical enclosures, such as air conditioners, vortex coolers, air to air heat exchangers, purge & pressurization units, filtered fans, and thermoelectric coolers.

ISCO Industries is a global customized piping and other HVAC solutions provider based in Louisville, Kentucky, USA. ISCO stocks and sells a wide variety of piping materials and provides solutions for various environmental, geothermal systems, industrial, landfill, mining, municipal, nuclear, waterworks and culvert-lining applications worldwide.

ISD has built and maintained its position as the foremost specialist in cold store construction. With a full range of design, installation, and manufacturing services, ISD Coldstores provides the complete solution for the installation of temperature-controlled envelopes at distribution centers for major UK supermarket chains and many other organizations.

Island Distributors is a wholesaler of Plumbing, Heating, Electrical, Waterworks and Industrial supplies for Cape Breton Island. With over 150 years of combined experience their dedicated staff of 15 are committed to serving the customers with confidence and knowledge.