The transition to sustainable energy sources is crucial for reducing the environmental impact of mountain huts, which play a vital role in supporting outdoor activities and promoting environmental stewardship in alpine regions. This study investigates the challenges and best practices associated with performing energy renovations on existing Italian Alpine Club (CAI) mountain huts. We introduce and test a newly developed protocol specifically designed for this specific architectural typology. The protocol, building up from the European Ecolabel, rates the environmental performance of mountain huts by considering various aspects, including management practices, energy sources, transportation, and hospitality. The proposed rating system is applied to some case studies in collaboration with CAI, with a specific focus on the huts’ energy performance and the types of energy sources they utilize. An energy performance analysis is conducted on the case studies using dynamic simulation tool, providing a detailed assessment of current energy usage patterns and thermal comfort. Based on the results of the rating system and energy performance simulations, we propose a set of targeted retrofit and renovation solutions aimed at reducing the huts’ energy consumption and increasing their sustainability. This paper evaluates and validates the proposed approach, offering a replicable and scalable model for energy renovations in delicate and off-grid settings. The findings will serve as a baseline to standardize renovation interventions across the entire network of huts owned by the Italian Alpine Club, contributing valuable insights to the field of sustainable building practices in challenging environments.