I'm having the same problem and know that in the summer I can almost guarantee that it will reach between 83-86F
There is next to no evaporation for week's, so I'm guessing I might have to sacrifice the look's a bit and possibly cut opening's in the back and maybe drill the top.
when I lift the lid you can really see the built up evaporated water sliding off of it.
unless I upgrade the fan's but I'm sure the evaporation will ruin them in the long run.
on a side note: does anyone know where to buy the p.c light's? hopefully near windsor?