Cochins are gentle souls and I've not had a mean one. I no longer raise them so I can just go from having them in the past. One of my very favorite all time birds was a gold laced cochin. He was beautiful and very docile. I would keep him unless he starts acting aggresive.
I used to use misters all the time. Even bought a huge set up to do several feet of misting at once... which I promptly missplaced and haven't ever found. I use pans of water, trash can lids, cut off barrels etc for the birds to stand in. When using a mister use them outside where it will dissapate... not in the coop itself. Using one in the coop can create a higher heat index and cause respiratory problems for birds. Great cooler outside though. I like using fans. Chickens can handle the heat if there is a breeze blowing. It's those hot humid still days that kill them.
I run electric cords all the time around the birds. They don't bother an electrified cord. However if it isn't plugged in they might bother it. My geese are the worst. They will chew on anything but not a cord that is powered up. Unplug it and it gets eaten!!!
It was really hot today. I can't imagine the weekend getting alot worse.