 There are certain tasks that we can leave till the cooler part of the day and do in the cooler times of the year, but there are certain tasks that really do need to be done. In some industries, that might mean having cool rooms where people can actually go out, do their job and come in and cool down. Certainly, even in Australia, some jobs are done at night, as it is a lot of the road making in summer is done at night, picking the grapes.