The new investigation by DeSmog and Politico found boutique Paris-based PR firm Digital Tellers is linked to a web of connected Facebook groups and accounts, which regularly share false claims about the cost, noise and reliability of heat pumps.

Electricity-powered heat pumps, which draw air from outside homes and transfer it into heating, are critical to Europe’s plans to reduce its reliance on volatile, planet-heating gas.

Studies show that this low-carbon technology is up to three times more efficient than gas boilers, and, when properly installed, can halve households’ heating bills.