agreed, but it's 23% of the difference just for "emergency" winterizing. No idea how the UF stadium is constructed, but the Beav is an erector set and concrete. This probably makes it more expensive for PSU to bring it up to standards and I have no idea if/what considerations there may be, having to build for cold weather vs warm. My point is that the state of Beaver stadium and geography likely makes it more expensive for PSU to do what needs to be done. IDK if it accounts for the remaining 77% of the difference, but I don't think it's near zero.
EDIT: Pics can be deceiving, but from looking at the UF stadium, it looks a lot more modern than what PSU is working with.
en.wikipedia.org