6 gpu's in a small bedroom is crazy.
I will get hot in no time.
my room is like that and i used to have 10 x R9 280X and before that AMD 7970, it was noisy as fuck, and hot as hell.
if you need to turn the ac all the time then you will use more power than the mining rigs produce, no good.
in a small room i will not put more than 400W of heat, so 3 maybe 4 undervolted, and operating at lower intensity RX 470 MAYBE, 4 x GTX 1070 better, not more than that.
if you shut down the fans, with the cards mining, they will DIE, even if the GPU temp doesn't look too high, because the temp sensor is on the GPU die, not on the memory or VRM which a re the most sensitive parts and needs constant cooling, so no, mining, fans minimum at 40% not less, and deal with the noise
right now i have a vega 56 and a GTX 1080Ti which i am using to test new mining software, and the are a bit noisy but not so much, and the heat is ok, a small fan will deal with it
cheers
indkt