Modern hotels use EnOcean for room occupancy detection (door handles, door contacts, presence sensors) wired through to the PMS (Property Management System) to optimise HVAC, switching to Eco mode when the room is empty and to Comfort mode on guest arrival.

A typical hotel EnOcean architecture combines several battery-less sensors per room: a door-handle sensor (handle motion equals presence), a window contact, and a ceiling or wall-mounted presence detector. These feed a gateway, usually KNX or BACnet, which is then bridged to the BMS. The BMS subscribes to PMS check-in / check-out events to switch between Comfort and Eco set-points. Real-world deployments at chains such as Marriott and Accor consistently report 20 to 40 percent HVAC savings per occupied room on a dynamic-presence basis.

Always specify a window-contact sensor alongside the door handle; without it, an open window during Comfort mode will drain energy and ruin the savings model that justified the project.