I don't have air conditioning either as it's not absolutely necessary, but we do have lovely cool tiled floors which Beaglina lies on when it's hot. I also take her swimming on an afternoon - she loves it and runs round like a mad thing once she's cooled off. She'll play with the hosepipe too and I have to admit that last summer when there were a couple of really hot days I soaked her towel in cold water and then put it over her - she did look pretty silly though!