In this paper we describe the innovative approach that Telecom Italia is adopting in order to identify new strategies for saving energy in the environmental systems. After presenting the guidelines of the Italian Operator in the matter, we concentrate on the solutions adopted to optimise the cooling systems within TLC rooms. In particular, the paper focuses on an energy simulator (SIMEN), that has been developed to provide Telecom Italia with a support tool, useful to evaluate and compare different cooling systems, and to help identifying the strategic solutions for energy saving. Furthermore, we present the results of the analyses we carried out on some TLC rooms of Telecom Italia, by using SIMEN.