page_title: Chase Field
section_title: Roof and cooling system
hierarchical_section_title: Chase Field / Roof and cooling system
caption_attribution_description: English: Aerial view of Chase Field and Phoenix from the south, on approach to Phoenix Sky Harbor International Airport
context_page_description: Chase Field, formerly Bank One Ballpark, is a baseball park located in Downtown Phoenix, Arizona. It is the home of the Arizona Diamondbacks, the city's Major League Baseball franchise. It opened in 1998, in time for the Diamondbacks' first game as an expansion team. Chase Field was the first stadium built in the United States with a retractable roof over a natural-grass playing surface, which was replaced by synthetic turf in 2019.
context_section_description: Chase Field's roof is opened or closed depending on the game-time temperature.  Even when the roof is closed, the park's windows allow enough sunlight to play in true daylight without overheating the stadium.
  The roof, which takes just 4½ minutes to open or close at a cost of $2–$3, is closed three hours before game time using two 200-horsepower motors triggered from a control room in the upper deck above left-center field. A massive HVAC system then drops the temperature inside the park to about 78 °F (25.5 °C) by the time the gates open.  The chilled water system, which has cooling power equivalent to 2,500 homes of 2,000 square feet (190 m²), also serves more than 30 buildings in downtown Phoenix. The cooling plant, located in a separate building right outside the ballpark, freezes water overnight to reduce daytime electricity demand.  Originally, the HVAC system didn't cool above row 25 of the upper level, exposing fans in the higher rows to the brunt of Phoenix' oppressive summer heat. Changes since then keep virtually all of the facility in air-conditioned comfort.
caption: Aerial view of Chase Field and Phoenix from the south, on approach to Phoenix Sky Harbor International Airport
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