^This. I think it's sweet that the OP cares what the neighbors think about water runoff from cooling, but unless there are water restrictions in their neck of the woods, it's not really the neighbors' concern!
I brew in my garage because I don't want to melt my composite lumber deck! (Aside from cost, the only true downside to that type of decking, I would imagine....)
The neighbors hardly notice, and don't care a bit, especially after the first homebrewed beer most of them have ever had arrived in the neighborhood block party beer exchange and was a quick favorite...
I pee in my yard too, but I try to keep that in the back....