How can the heat transition in existing buildings really succeed? This ISH 2025 presentation takes the audience on a hands-on and engaging journey through the challenges and opportunities of energy retrofitting – from ownership structures and building analysis to specific measures and funding options. Topics include efficient heating systems, realistic retrofit roadmaps, key investment moments and the right level of insulation. Using a wide range of examples – from single-family homes to multi-storey buildings – it becomes clear: climate neutrality is achievable with early planning, inclusive communication and the right partners. A motivating yet critical look at the current state of energy consulting – with one clear message: the time to act is now.
This lecture is supported by FGK - Fachverband Gebäude-Klima e. V.
Stefan Bolln…
…has been the national chair of the German Association of Energy Consultants (GIH) since May 2023. A master chimney sweep and independent energy consultant, he brings extensive hands-on experience in building energy. His political background includes serving as energy policy spokesperson for the SPD in Schleswig-Holstein until 2012 and as a member of the state parliament. He was also part of the national board of the chimney sweeps’ union. This unique combination of technical know-how and political insight helps him drive quality in energy consulting and reduce bureaucratic barriers to building retrofits.
