Puddin' Man wrote:
Insane House Cool-Down Scheme
[snip]
What (aside from sanity, which I do not possess) would
keep po' me from somehow mounting a sprinkler or 2
on the roof, running them with a garden hose, say,
from 11 AM to 7 PM (to cool the house, which retains
heat like crazy)??

Nothing, but don't expect much.

It's a strong function of the temperature of your
water coming out of the hose, which is probably a
bit under 70F if your lucky. But it will take ALOT
of water, and flowing pretty quickly. It will
also tend to cool the peak of the roof the most.
It's also hard as heck on the shingles. Do you
have any roof ventilation? That's gonna help
the most.

Planting grass up there would probably do more,
but the roof probably can't take the weight.