Member States shall ensure that, when a technical building system is installed, replaced or upgraded, the overall energy performance of the altered part, and where relevant, of the complete altered system, is assessed.
Áiritheoidh na Ballstáit, nuair a dhéanfar córas teicniúil foirgnimh a shuiteáil, a athsholáthar nó a nuashonrú, go ndéanfar measúnú ar fheidhmíocht fuinnimh fhoriomlán na coda athraithe agus, i gcás inarb ábhartha, an chórais athraithe ina iomláine.