I know it's stupidly expensive for something that's made from recycled toothpaste tubes and lego bricks, wood screws and wobbly bits but by jingo, it's brilliant! In the heatwave conditions we have at the moment it's a joy to plonk it in between our single beds on the lowest setting and bingo!, overnight air conditioning (nearly). We have a 12v converter so use it on sites electrickery as well. I understand that doggies love it as well because, and I have to admit I don't fully understand the physics behind this, the sucky side cools as well as the blowy side but without the gale force wind.