@NFM
What sort of temps are we talking here? 35+°C?
Try and steer clear of evaporative cooling (the ones you put water/ice in) unless of course you enjoy the smell of mildew and the presence of mould on your walls and curtains. You can buy portable refrigerated A/C units, but they are tad more expensive than a wall mount or split system. Just go for it, a sumner without A/C (in Australia anyway) can be quite unbearable.