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The cooling plant to my knowledge, is not owned by the park or the city. It used to be owned by NRG, then Westwind, now Cordia I believe. Contractually, or via other means, it may be obligated to serve the ballpark first; I think it was even put in because of the ballpark. It also provides chilled water to a number of other properties in the area, including the Phoenix Biomedical Campus a couple blocks north - I was the Director of Facilities Management there for a decade. The plant may be providing sufficient cooling water - when the Dbacks say "the HVAC is broken" (or doesn't work well, or whatever) - it could be anything from the exchangers, to the air handlers, fan coil units, VAVs, design, configuration, programming, etc. The problem (usually) with chilled water cooling like that is typically with a building it is like turning a battleship. Takes a long time to cool down a load that big. District cooling is friggin expensive - one of my (huge) buildings was like a million bucks a year for chilled water