Challenge The Toledo Zoo’s Museum of Science building, constructed in the 1930s, houses offices, animal exhibits, the education department, a theater and a large hall sometimes used for special events. The building was being served by an older 80-ton Trane chiller with two 40-ton compressors, one of which had stopped functioning years earlier. The zoo wished to increase its cooling capacity to include the indoor theater, while replacing its aging HVAC system. With the facility’s electrical substation also nearing capacity, crossing the peak demand level, even once, would require the zoo to upgrade its service, resulting in a substantial increase in utility costs. The zoo sought a solution that would allow them to keep the building comfortable for employees and guests, without increasing el

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