| 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 | |
| Silver Ball Solutions | |
| National Technical University of Athens | |
| Heat Pumps Watch | |
| 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. | |
| Carrier 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 | |
| European Environmental Agency | |
| Klima-Agence | |
