This operation aims at the energy renovation of 325 homes in Frouard, Champigneulles and Custines (40 dwellings are ineligible due to too little energy gain: Guynemer and Mermoz buildings): Montesquieu, Voltaire, Rousseau, Diderot, Rolland, Eluard, Camus, St Exupery, Blériot, Zola, Voltaire, BAT A de Custines, BAT B de Custines and BAT A Letters of Tassigny de Custines.