https://www.sac-emmental.ch/huetten/heftihuette.php

Heftihütte is a cozy mountain hut in Flühli, Switzerland, at an elevation of 1,904 meters. It is operated by SAC Emmental and not serviced. You can book it online though and then you will get a code to gain access to the hut. Heftihütte might just be your new favorite hideaway in the Swiss Alps! (Because it certainly became mine). There is 12 beds available, so note that you might share the hut with other people!