Abstract We analyse the different components that are part of the heating, domestic hot water (DHW) and air conditioning facilities. For each of these components we show the conventional equations of conservation of mass and energy and from them exergy balances, as well as the corresponding expressions to characterize their efficiency, both through conventional energy performance and with exergy. Later, we look at cogeneration facilities, undertaking a review of micro-cogeneration technologies and then presenting the energy and exergy parameters with which the behaviour of these technologies is characterized. We end the chapter looking at equipment, such as energy storage systems, that must be analysed as dynamic systems due to its inherent properties. After a conventional energy analysis in the three phases of loading, storage and discharge, we characterize its behaviour through exergy analysis, highlighting the usefulness of this analysis and the additional information that it provides.