We had some 90 degree days last week, so I'd take the hose out to the girls yard and do a light spray up in the air. The girls would come racing out of the coop and throughly enjoy the shower. Then I decided to do what you did. I attached a drip line hose, with misters, and attached them to go across the top corner of their fenced yard. When I turned it on they ran from it, like yours did. I removed all but one mister and that seemed to be better. By the time I'd fine tuned everything it was getting dark and now it's dropped into the 60's, so I haven't turned it back on. I think that once they get used to it they will appreciate it. I'm thinking that maybe the sppppp noise from the mister might frighten them til they get used to it.