Ok, I am at my wits end here! I know it must be the coop, but I just can't figure out how IT is the source of the smell!!! I will explain, and maybe someone can clue me in here... We had a woodshed with a small shed attached (a 9x10 walk in shed all up off the ground by 2-7 inches, less in the back - more in the front) THIS was to become our coop. As you can see we insulated with Blueboard to keep the heat out in the summer and heat inside in the winter. We put four 6x6 vents in the ceiling going up into the space between - whcih is about 6 inches - the goes out back to the open back where we put hardware cloth - it is working VERY well - NO smell INSIDE the coop at all!!! As you can see these two are in the back, then we have 2 more up front, no smell inside the coop! yea! Here is the coop and run: the chicken door is open all day unless we are gone - the coop is in sight all day from the house and in ear shot - NO issues at all with safety. I have had the large window out on warmer days and tarped the run during those super hot days to keep the window shaded. Fortunately the sun is only on the coop for 3-4 hours a day. We insulated, put DE inside all the walls prior to putting up the walls to prevent moisture and bugs (mites ect...) have vinyl flooring and use pine shavings from the horse farm with DE inbetween the layers.... we clean out frequently. But as i said there is NO smell inside! it is outside!!!! and it smells like a DEAD rodent!!!!!!!!! The smell started BEFORE they even moved in - it was THAT day they moved in and i notice on the front corner on the left there was this smell OUTSIDE like a dead mouse or something. Years ago i had one or two die in my ceiling of my finished basement in my old house and that smell is unmistakable!!! So we raked out and raked out under the coop and put a good dose of DE down. It smells off and on - more ON with hot humid days... again. NO smell inside, but to be around the coop outside at times is really unpleasant. We rake every day - no really - every single day we rake out the run - sometimes two times. we DE around the outside of the run and coop as well as inside to help with moisture and bugs. i just don't get where this smell is coming from or HOW to get rid of it. Even after taking ALL the shavings out and starting from square ONE - it still smelled - but OUTside.... Any ideas????? I am a neat/clean freak and am really hyper sensitive to smells - this is driving me crazy!