> 90/90 is lethal, isn't it? If you stay out in it without taking any precautions for long enough, it could be. But that doesn't mean that as soon as you step

> 90/90 is lethal, isn't it? If you stay out in it without taking any precautions for long enough, it could be. But that doesn't mean that as soon as you step out of your front door in the summer in, say, Houston, Texas, you fall over and die. Millions of people in the US (quite possibly billions if you count the rest of the world) live in places where the outside conditions are 90/90 (or worse) frequently in the summer. > it's some pretty extreme conditions you chose As I have already posted elsewhere in this thread, 90/90 is a condition that is commonly tested for HVAC systems; it's not at all "extreme".