In a house, I think as long as you're able to evacuate the heat without pulling too much hot air back into the house, they'll be safe.  Mining with ASICs in a warehouse (with 107F outside temp) still allows for "cool" air to be pulled through, while dumping the hot air outside.  GPUs might need a little help, though.  A makeup air system works best, in this kind of situation.  107F cooled down to 85F or so, is all you need.