text:  It can be a real range, but a lot of what I heard were completely outdated HVAC systems. So air ventilation that, you know, the machinery was super old, like 20 to 30 years old. So things kept breaking and they couldn't find replacement parts that the quality of the air inside the classroom was just like stuffy and not being cycled in from outside. Some people did replace their air conditioners, especially in places in the South where it gets super hot. And they said, you know, kids could be fainting or getting sick if their air conditioners broke.