What made you decide I got no fan in my case? I got 2 on my shrakoon t5 black value
I believe he actually meant IF your case has no fans.
Anyways, You'll fine with stock cooling. Even if your ambient is high, your CPU should still be below the max safe temp.
Which is probably 80/85c.
If it gets hot, i.e 80c + then you could always opt for an aftermarket Heatsink.
preferably the hyper 212+