The Energy Performance of Buildings Directive(EPBD) is the EU's (European Union) main legislative instrument which aims to promote the improvement of the energy performance of buildings within the EC.  The Energy Performance of Buildings Directive is designed to help reduce carbon emissions from buildings. One of its articles states all air conditioning systems over 12kW should be inspected regularly (at least every five years). These inspections will highlight ways to reduce carbon  emissions and may also reduce running costs.