Brooders I use old fridges work well .

Love the idea's in this thread

And going to do a few of them
I do worry on how to keep my colourbond hen house cool in the next summer.
going to do the frozen water melon idear ( just not put it in the sun like last summer un frozen)

Soft drink bottels with froxen water inside to keep the water cold

My hen house faces east so last summer or on warm days the girls chose to stay in the hen house in the morning's and use the run when the hen house shades it.

Also last year I used the hose quite a bit making the concrete floor in the hen house wet then the girls would stand on it

As well as spraying water to cool the air above the girls.

have been thinking of installing a whirly bird in the roof of the hen house