It was a combination of several factors that are responsible for the boom. The Fridays for Future movement had probably prepared the ground and allowed the realization to mature that the era of oil heating is finally over. Then the tourism lockdown ensured that property owners not only had money but also time to tackle the long-postponed heating renewal. Finally, new, attractive federal funding programs for ecological heating renovation gave a huge boost. The state decreed end of oil and gas heating seems to come faster than expected.