| Financial institutions | BNP PARIBAS PERSONAL FINANCE |
| European Bank for Reconstruction and Development |
| Findustrial GmbH |
| OTC Flow |
| Utility, regulator or network operator | Council of European Energy Regulators |
| EDF (Electricité de France) |
| Enel |
| Energia Customer Solutions Ltd |
| Energy Hub |
| Eurelectric |
| Geonova Oy |
| Iberdrola |
| Ressorts |
| RWE AG |
| Veolia nv |
| Installer/contractor | Easykit |
| Equans |
| F. Boing management |
| GRAND ALPHA |
| INFINIPLUS |
| Wayse-Soluções de Energias Renováveis, S.A. |
| Research Institute or Civil Society organisation | Agora Energiewende |
| CENTRE FOR RENEWABLE ENERGY SOURCES AND SAVING |
| co2online |
| Energiesprong Global Alliance |
| EPB CENTER |
| European Climate Foundation |
| Heat Pump Centre (HPT TCP by IEA) c/o RISE Research Institute of Sweden |
| LCP Delta |
| Pixii |
| Reform Institute |
| Regulatory Assistance Project |
| REScoop.Vlaanderen |
| Strategie & Kommunikation #Wochederwärmepumpe #GermanHeatpumpWeek |
| TNO |
| University of Bayreuth |
| University of Galway |
| Industrial actors (heat pump and component manufacturers and industrial consumers) | AFEC |
| Airthium |
| APPLiA |
| BEUC - The European Consumer Organisation |
| Chamber of Installation Specialists in Bulgaria |
| Confederation of Danish Heat Pump Industry |
| Croatian Heat Pump Association (HUDIT) |
| CTC |
| Czech Heat Pump Association |
| Daikin Europe NV |
| Danfoss |
| delta dore |
| Diehl AKO Stiftung & Co KG (Diehl Controls) |
| EHI |
| EPEE |
| Euroheat & Power |
| European Geothermal Energy Council |
| European Heating Industry |
| Eurovent |
| Heating Performance Lab GmbH |
| LG Electronics |
| Mitsubishi Electric Europe B.V. |
| Panasonic Heating & Cooling Solutions Europe |
| Qvantum Industries AB |
| Regal Rexnord |
| Samsung Electronics Air Conditioner Europe |
| Siemens AG |
| Slovenian Energy Association |
| Sofidel Spa |
| Trane Technologies |
| TURBODEN SPA |
| Vaillant GmbH |
| Vastint Development B.V. |
| Viessmann Climate Solutions SE |
| Wien Energie GmbH |
| National/Regional authorities or Energy Agency | Austrian Energy Agency |
| Central Statistical Bureau of Latvia |
| Directorate-General for Energy and Geology (DGEG) Portugal |
| Energy Service Cyprus |
| Federal Ministry for Economic Affairs and Climate Action Germany |
| Flemish Energy and Climate Agency (VEKA) |
| Medjimurje Energy Agency Ltd. Croatia |
| Ministero dell'Ambiente e della Sicurezza Energetica Italy |
| Ministry of Climate and Energy of Latvia |
| Ministry of Economic Development and Technology Poland |
| Netherlands Enterprise Agency |
| Sustainable Energy Authority of Ireland |
| Sustainable Energy Development Agency (SEDA) Bulgaria |
| Swedish Energy Agency |
