Well ... Harbaugh is correct on this one.
Purdue has annual athletic revenue in the EIGHT figures. Given such, it's absurd they find a way to provide air-conditioning for their guests. Ditto for providing an adequate number of toilets, and medical facilities.
That's minor league, and Purdue (most specifically, former AD Morgan Burke and current AD Mike Bobinski) deserve ridicule for such.
I've been to four games in West Lafayette. I've been to games at all B1G stadiums outsides of Maryland & Rutgers. Purdue is --- by several orders of magnitude --- the most minor-league in terms of their facilities and such.