The project Operation of Building Infrastructure Systems of Energy 2000 promotes the practical optimisation of the operation of heating systems by encouraging all involved parties, from manufacturers to service engineers and on to janitors, to use the existing energy saving potential of 10 to 15% through correct operation and maintenance. More than 2 500 janitors have received instructions. Energy 2000 check-ups for heating systems are available for private house owners. IEA/IRENA Global Renewable Energy Policies and Measures Database © OECD/IEA and IRENA, [November 2020]