During these extended periods of hot weather don't forget to look after all your pets , WORMS included. Make sure your worm farms are not in any direct sun by keeping them on the shaded south side of your house or under a tree or even in the side passage or garage. Give the farm a good drink when you know the forecast . And in the extreme I've seen wet hessian or towels draped over worm farms to act like a radiator in the arid summer of the inland. Others have even suggested ice cubes above the worm farm blanket too.