You can't use those "swamp coolers" anywhere near the coast in Qld, all they do is make the heat absolutely unbearable by pushing the humidity through the roof.
That's true mate, but that's what you get for living in a tropical climate. I lived in Brisbane for a couple of years, and the first year I was there I painted a mate's car over Easter, with Acrylic Laquer, when the humidity was close to 100%. 4 litres of Ferrari Red wasted, but a lesson learned.
Luckily enough, the humidity down here never gets much over 50, so the Swamp Cooler is ideal, and the other benefit is that you can have all your doors and windows open, so your house (or garage) doesn't stink like an old fridge. Cheers, Terry.