<p>The village of Copahue located in the southern Argentinian Andes is built on top of one of the largest volcanic-hydrothermal systems in the country. This village exhibits a unique residency pattern, becoming active only during the austral summer, when thousands of visitors are attracted by its thermal baths and wellness activities. Paradoxically, the same thermal emissions that serve as an economic resource and draw tourists to Copahue also pose multifaceted hazards to the exposed population. Motivated by unofficial reports of incidents related to this complex interaction, we carried out the first gas hazard assessment of the village. We employed a mixed-methods approach integrating soil gas and temperature measurements, MultiGas analysis, topographic survey, visual inspections of buildings, and in-person interviews. Our findings reveal a direct relationship between building damage and the two main soil degassing areas in Copahue, as well as the thermal lagoons. The observed structural damage includes corrosion, cracks in walls and floors, cladding detachment, and structural collapse, and indoor CO₂ and H₂S concentrations exceeding occupational safety limits, and ambient temperatures up to 46&#xa0;°C. Interviews provided valuable complementary data on building construction practices, impacts of thermal degassing, and mitigation measures. In addition, we present the first CO₂ susceptibility map for the village of Copahue, which provides a useful resource for land-planning and risk reduction strategies. Importantly, this research not only advances our understanding of hydrothermal gas emissions and their effects on infrastructure and human health, but also highlights the underreported role of H₂S exposure and extreme ambient temperatures—factors rarely addressed in previous studies of similar environments.</p>