Just clutching at straws here but I'm an expat so no idea about cooling houses down.
I'm in a Victorian terrace and renting so can't install air con. We can't buy a portable air con as had grills on the window and real estate won't let us cut it. Short of moving and fans what can we do? DD's room is nearly 30 degrees some days so no chance of her sleeping in there. Naps have to be out in the pram or me driving around in the car.
Tried a water evaporative cooler and it's rubbish.