There is no way on planet earth that you will get your miner to run cool without noise in a 40 degree temp without an AC , your best shot in terms of controlling the temps would be setting the fan to 100% and getting red of the heat using the ducting which you already have.
ok I forgot, there is 1 way on earth, immersion cooling , but that will probably cost you more than turning them off for now till the weather gets better, if you decide to keep them no at least under-clock them , use the ELPM on bitmain's firmware or install Braiin's OS and set a very low freq and voltage until
By the way, temps here are just the same, they float between 30 and 45 , if you drop an egg on the road it will be instantly fried , I parked my car under the sun earlier, got my hand burned trying to open the door (no joke) , and for my miners, I use AC all the way and keep praying for
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fwww.ina4.com%2Fassets%2FUploads%2Fwinter-is-coming.jpg&t=665&c=Kn7v0XtS8bOBlw)