A growing hotel sector makes a significant environmental footprint. Due to a contemporary focus on climate change and high competition within tourism, enhancing sustainability through energy savings is a priority for many hotels. Through technological innovations, Internet-of-Things (IoT) technology provides the opportunity to integrate more systems (e.g., heating, air-conditioning, window-openings) on a platform (also known as smart management), making it easy for a hotel guest to operate room conditions through a single device while also optimizing hotel operations. A research gap on the likelihood of adopting IoT technology to pursue sustainability in the hotel sector exists. Based on explorative case studies of five high-end hotels, this paper offers propositions on drivers for hotels' use of IoT to deliver on their sustainability goals. This study suggests that a hotel is more inclined to implement IoT if (1) the hotel is focused on energy savings, e.g., due to green certificates; (2) it belongs to an international hotel group; (3) decision makers perceive sustainability to be important for their customers; (4) the target group is more B2B (business) than B2C (leisure); (5) the hotel a five star one; and (6) the hotel guests come from Northern Europe or North America.