Texas? Forget the swamp cooler, too humid. Misters will NOT work on the rabbits and will just rust your cages-your humidity is too high. Now, if you rig them up to wet the parts of roof that are in the sun, that would help. Do not enclose this unless you are putting in an a/c unit, they will die. Fans-you said one in the middle? Not enough unless it’s a giant oversized one. 35′ is a long way to push air. I’d put three at least in this…stagger them, so one on the end on left, one in middle, one on the end on right. I have 3 going in a 10×20. You need more airflow pushing the hot air out. I would also add one at the end of that middle row…I can’t tell what that is, but if it’s two levels down the middle they’re going to get hot fast, too many bodies too close together. If you have solid dividers in cages, put those at the end of the rows -the dividers block airflow. The end that’s in “full sun”…how much of it? Can you put shade cloth across the back at that end (use the beige ones)? You’ve got to get that roof out of the sun-the metal will literally bake your rabbits. If you have to buy shade cloth and throw it over the top and tie it down, do it. Best thing would be insulation under the roof, foam sheets or anything. You might consider something on top of the cages for an added buffer between them and the roof-the corrugated plastic at home depot comes in 8′ sheets, I’ve cut those in half so they’re 2×8 and laid them across the cages. It looks like you have an auto waterer, seriously consider adding crocks especially in the cages the struggling animals are in…I never set mine up after I moved because I came out one hot day and half my rabbits were curled up against the water bowls cooling off, even the plastic bowls. Some also put their feet in the bowls (watch out they don’t stay there too long and get a fungal infection, if they start losing hair on top of their feet it’s plan B time). Source: I’m in Florida…its 92 in the shade right now…
