DS’ bedroom is ridiculously hot. He’s in the roof. We live in a tiny 2 bed cottage so have no choice. He’s really struggling to settle at the moment as it is and the heat heat is compounding the problem. DH has just been made redundant so we really can’t afford hundreds on a proper air conditioning unit. The two hour battles at bedtime in a 30 degree room are causing a lot of friction. We keep the blinds shut in the day, having the window open makes no difference, we run a decent fan a couple of hours before bedtime. All I can find within budget are small air coolers that you full with water/ice. Do these really work?