On a completely different subject: THE HEAT IN AZ
So last year I put a little 7" personal fan out in the coop, much to the electric bill's dismay. BUT, I stopped having losses from heat stroke, and the chickens would all chill out under the fan.
This year I wanted a solar fan, to save the $, but they are ~$250 for a decent one!!!
Anywhoo, I was doing research on the little greenhouse fans and apparently ordered one, because I TOTALLY don't remember ordering it.
It came today, and actually is pretty sweet!
http://cgi.ebay.com/Solar-Panel-Pow...010?pt=LH_DefaultDomain_0&hash=item5643cbacf2
If you had a large-large doghouse, this fan would make it a wind tunnel. I hung it upside-down under the chicken ladder to prevent roosting and poopage. I think 10-12 chickens can safely sit under it, enjoying a breeze.
I stuck my finger in it, and it only hurt a 3 on a scale of 10...with no skin breakage.
ANywhoo, I will let you all know how long it runs. I would bet it will last at least a season. I am also going to run my old fan on the usage meter, to see what the cost savings will be.