• United Technologies Corporation (Carrier Corporation)
• Daikin Industries Ltd.
• NIBE Industrier AB
• Viessmann Group
• Ingersoll-Rand PLC
• Stiebel Eltron GmbH & Co. KG
• Robert Bosch GmbH (Bosch Thermotechnology Corporation)
• Panasonic Corporation
• Mitsubishi Electric Corporation
• The Glen Dimplex Group