In the 1860s two studies on heating and ventilation: "Consideraciones generales acerca de las aplicaciones de ciertos principios científicos a la teoría y construcción de los aparatos de calefacción" by Lucas Echeverría, and "Calentamiento y ventilación de edificios" by Francisco de P. Rojas, were undertaken in the space of four years. The former paper was delivered to the Royal Academy of Sciences and Arts in Barcelona in March 1864 but was never published, whereas the latter was published and awarded a prize by the Royal Academy of Exact, Physical and Natural Sciences in Madrid in 1868. Shortly afterwards, Josep Vallhonesta published in Barcelona his "Nuevo sistema de ventilación para mantener frescos en el verano los edificios públicos y particulares", a study on ventilation and natural refrigeration. The three studies were undertaken by industrial engineers who were or became teachers at the School of Industrial Engineering of Barcelona. They were also members of the Royal Academy of Sciences and Arts in Barcelona. The present paper seeks to analyse these works in their context and to highlight the innovations introduced by the authors from the practical and the theoretical perspective

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