Lana,
Just ran across this thread , How are the bunnies doing?
I don't know if this will work for rabbits but we have a slab of marble in Phoebe's cage (chinchilla) suppose to help her keep cool. Chinchillas are too hot at 75 deg, lucky she lives inside with the ac but the back room still gets above 75 some days.
At the fair I see frozen water bottles in the rabbit cages
of course you look to have a lot of rabbits both suggestions may not be doable.
