The fan has cooled it off a few degrees and quickly. Its done. God job at circulating the air, which seems logical?
As far as adding vents on the overhang, I am not sure, honestly. I thought of cutting out a rectangle from the back wall and covering it with hc?
I'm a big fan of fans.
The fan we use for ventilation is made for the choking dust created by the chickens, I think I linked in another one of your threads, but I will link it here again. Every attic fan I looked at actually specifically had a "not for use in chicken coops" warning.
https://www.valleyvet.com/ct_detail.html?pgguid=D74B298D-3C6F-4287-9F9F-4EA09B8D0A73
Be aware that there are other versions of this on Amazon that do NOT have a plug.
These fans can double as a window for passive air - simply by propping the shutters open with a short chunk of 2x4- and will still be predator proof. And when the shutters are shut, it's about like a closed window- mine is on the side of the coop that takes the prevailing winds in fall/winter- and has held up just fine.
Ventilation fans like this will let the air in the coop equalize with the outside temperature quickly. But on nights that just don't cool down, merely having the temperature the same inside and out isn't enough.
Mine love being in front of the fans in the coop - I have 2 24" fans up high (though it's a bigger coop with multilevel roosts- 130+ birds) that are 5000cfm - and a barrel fan for down low. Those help during the day when the chickens are laying, and at night the fans blowing on them helps quite a bit- they will actively jockey for position to get close to the fans.
Although now when it's just not going to cool down overnight, I close the windows, turn off the fans and wheel out the air conditioner, vented out through a window.
Keep in mind anything not meant for livestock use will absolutely have a shortened lifespan in a chicken coop and can indeed become a fire hazard. I have to replace those other fans regularly. The one meant for livestock soldiers on.
After the heat events we've had these last few years, I just don't travel in the warmer months - from May to the end of October, even with an excellent farm sitter checking in a couple times a day. But that's just me.