On the 27th, Seibu Lions announced that in order to cool Belluna Dome area for the 2026 season, they will install seven large umbrellas and eight mist poles in the plaza in front of the dome, and from February they will gradually introduce 16 long fans on both the first and third base sides in infield area and 10 circulators in backstop area.

Although the entire stadium is covered by a roof, the area around the stadium concourse is open, and it is known for its tendency to trap hot and cold air Belluna Dome. In a game against Nippon-Ham on June 27 last year, Tatsuya Imai pitcher (27), who pitched first, had to leave the game in the middle of the 4th inning due to "heat stroke." For the 2025 season, we have been making concerted efforts to improve the environment to match the characteristics of a nature-symbiotic dome stadium, including the introduction of a large-scale misting system and a "BIG WATERFALL" waterfall system. The company has been making concerted efforts to improve the environment in line with the nature-symbiotic characteristics of the dome stadium.

Speaking to reporters on February 2nd at Nango Stadium in Miyazaki, where the first team was holding its spring training camp, owner Takashi Goto (77) said, "There are also issues with the terrain. We will consult with experts and do our best. This is a major issue for us that will continue for a long time to come. We will be taking serious measures to combat the heat, as well as taking measures to combat the heat in terms of fan service, so please look forward to it."