The handbook for professionals is oriented to intermediaries (e.g. chimney sweepers, installers, energy advisers, etc.) and investors (e.g. building developers, housing owners, energy suppliers and DH operators, etc.). The report (in all project languages and English) includes differentiated information for both target groups, on why to promote and invest in sustainable solutions for heating and cooling, planning guidance, typical mistakes, training options, financing opportunities, business models, technology factsheets including selling points to approach clients, etc.