Wall matters some, trapping the heat. 70 is fine, tho, have you tried you fans lower? At 100%, they may not last as long as youd like them to. Theyll last, but will shorten their lifespan.
If you can stay in the 70s, youll be fine. 80s is touchy, and 90s are a no no, tho, some do run that hot, and theyre fine as well. Try turning your fan back to auto, game and check temps along the way