Price per kwh, amount you can draw, what's your budget, how many miners can you afford/you want to buy....
Setting a shed for 4 asics or 15KW is different from 50 or 200KW!
You care about noise, how hot it goes, is there a ton of dust, and so on.
Anyhow you can start with topics like this:
https://bitcointalk.org/index.php?topic=5263722.0https://bitcointalk.org/index.php?topic=5454122.0and follow the suggestions, there are a few more but seems like the image links are broken.