For years, I have followed the rise of heat pumps as one of the central technologies for decarbonising heating. The numbers have been impressive, the policy support has been strong, and the narrative has been almost unstoppable. But as with so many technologies that capture political and public imagination, there comes a moment when promises have to turn into results. For heat pumps, that moment is now. After several years of double-digit growth, the global market is showing signs of fatigue. Sales have dropped sharply in some of the key European…
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