Concerning cooling.

From what I can see, the best cooling situation is pointing the outflow from your miners directly out a window or other opening.

I converted one of my basement windows to one big screened rectangle and then built a shelf on the wall that was the same height as the lower edge of the basement window. 3 841 and 1 821 are all pointing out that opening and the heat in the basement has dropped considerably and the miners are showing much better cooling. I still have 3 other miners currently in the garage but I may move them back into the basement if I can fix up a second basement window like the first.

The hardest part of the job was making the custom screen to keep bugs, birds, rodents, and cats out of my basement. One of the local hardware stores has a kit where you
can cut the aluminum side pieces to whatever length you need with plastic corner pieces holding everything together.

I had a set of old mini computer boxer fans in the basement window but they pale in comparison to the 160+ CFM fans the miners come with so I just just got them out of the way and have just the screen between the miners and the great outdoors. 

My only worry is if the neighbor across from my basement window has issues with the noise. They put up a privacy fence years ago, the wooden slat type, so I don't think that will be an issue.

I had worried I might need to stop mining this summer like I did last summer but it looks promising for continued mining if this setup keeps working as it has been.