Do you think they have to air condition indoor football games even when it is 20 degrees fahrenheit outside?

I’m watching the Michigan State vs. Ohio State football game right now. Gooooo green! it is in an indoor stadium in Indianapolis and I am sure it is below freezing outside, although I don’t know the exact temperature. I was wondering with all the lights and people, do you think they actually have to air condition the staidum? Or, heat it? Most people are wearing short sleeves, a few people have on a very light jacket.