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A climate control strategy that provides an alternative to a standard air-conditioning approach was designed in the library of Casa de Rui Barbosa Museum, a historic house museum located in Rio de Janeiro, Brazil. Based on condition assessments of the building, the collection, and the environment, climate improvement strategies were developed and implemented. The building envelope was repaired and original passive climate designs were restored. A ventilator/dehumidifier-based climate control system was installed in the cellar and attic, primarily for providing collection preservation in the library. Comfort for visitors was addressed through the implementation of a high air- exchange rate of the climate system and high air movement along visitor pathways. Energy conservation was incorporated through full ventilation during dry outside conditions (normally sunny afternoons), full recirculation, and hibernation modes during non-visiting hours. The installed system has maintained a climate of 60 ± 5% RH at 25 ± 3°C with reduced air pollution levels and particulate matters. Although the designed level of air movement was not achieved along visitor pathways due to difficulties encountered during the installation of floor grills, visitors have expressed comfort in the library due to lower humidity, a clean-air sensation, the elimination of direct sunlight, and low noise levels.
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