2024-01-22 05:00:10
CHRONICLE – To encourage households to engage in energy renovation work, governments have deployed energy treasures. In vain: the initial assessments were far too optimistic.
At the heart of the maelstrom of the ecological transition, the thermal renovation of buildings has long been considered an El Dorado where purchasing power and reduced emissions went hand in hand. In a 2007 estimate, McKinsey classified building insulation as the most profitable decarbonization technique, with a gain of 150 euros per ton of CO2 avoided. The reduction in the energy bill should quickly reimburse the cost of the work. Delighted by this discovery, Western governments have increased policies encouraging isolation.
To everyone’s astonishment, individuals took little notice of it. The reason for this disenchantment now appears clear. Initial assessments were far too optimistic. In a 2020 study (1), Matthieu Glachant, professor of economics at Mines Paris-PSL, estimates that for 10,000 euros invested in energy renovation work, households obtain an 11.1% reduction in their invoice, or…
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