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Insulate your exterior walls, attic or cellar for one euro. Redo your heating at half price while benefiting from all sorts of aid and bonuses. Everyone has seen these tempting offers in advertisements, by email or on social networks. For apparently modest sums, craftsmen or specialized companies promise to reduce your heating bill by 30%. Thermal renovation remains more than ever a priority for the government with new aid for an even wider audience. Behind these campaigns is a system set up by the state, energy saving certificates, CEE. In exchange for a reduction in their carbon taxes, large companies finance energy saving work in private homes. Impeccable on paper, the beautiful promise gives rise to an impressive number of poor workmanship, scams and fraud. Can we trust supposedly specialized companies? How to avoid poor workmanship and uncover fraud? Who ultimately pays the bill for this device that may be too good to be true? Director: Elvire Berahya-Lazarus