Fortunately there are a lot of electronic components that can't take the kind of heat you allude to (100C), and it would cost a lot to engineer components that

Fortunately there are a lot of electronic components that can't take the kind of heat you allude to (100C), and it would cost a lot to engineer components that could. 100F is a hot day in the southern US, and nothing compared to some of the warmer climates of the world. Compared to digging ditches or doing brick work, standing next to a rack loading code onto a router is small potatoes. I'll just be happy to work in a room where I can expect to be in short sleeve shirts instead of having my fingers get numb when near a cold air vent. If heat were ever to become that much of a problem I'd expect that we'd start seeing more solutions like HP's thermal management rack, where the racks are closed to the environment, take in cold water, and circulate hot water out.