I tend to see more and more air-con hoses popping out of windows open enough to accomodate them whilst out and about during summers in the UK. Units get cheaper, demand increases. So I'd say yes.

For me, a two litter bottle of water, frozen and stood in a bowl in my bedroom with the window and door closed. Does wonders as draws out the water with condensation upon the bottle - lowering the humidity. Also cools the air.

Though I'm sure I'll get some form of aircon in the next few years.