As of February 2009 the second release of the ‘Energiebesparingsverkenner’ is online. This is an interactive tool on the internet that gives insight in the possibilities of energy saving measures in existing houses. The tool gives information on the living expenses and how these change after implementing energy saving measures. Further information is given on the energy certificate and how this will change after taking measures, what the costs of the measures are and what the return of investment will be. This very useful instrument (only available in Dutch) can be used by consumers organisations, housing associations, municipalities, building contractors etc. to advise consumers professionally on the possibilities of energy saving.