American Gas Association, founded in 1918, represents more than 200 local energy companies that deliver clean natural gas throughout the United States of America (USA).

The Bundesverband Bioenergie eV (BBE) is the umbrella organization for bioenergy. It was founded in 1998 in order to give the diversity of bioenergy with all its manifestations and technological paths in the electricity, heating and transport sectors an effective representation in politics and society.

Federation of German Heating Industry owns 117 companies and 2 associated associations. Similar to the German engineering industry, the German heating industry is structured as a medium-sized company. The members of the BDH also include world market leaders with annual sales of between 2 and 3 billion euros. In 2020, the BDH member companies generated a total of 16.2 billion euros and employed 76,900 people.

The Central Association of Sanitary, Heating, Air Conditioning (ZVSHK) is the professional organization, trade association and interest group for the HVAC trades in Germany. The ZVSHK is the founder and sponsor of the world's leading trade fair ISH .

Heat Pump Federation lobbies government for long term policy supporting the electrification of heating and cooling, works to raise awareness, understanding and confidence in heat pump technology across both domestic and commercial sectors, and collaborates with government, industry and consumers to make this a reality.

Industrial Combustion is a manufacturer of burners designed for commercial, industrial, and institutional applications. Their burners are developed to deliver an impressive return on investment.

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.

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.