Do I really need air conditioning in the UK? The best portable aircon tested – plus the pros, cons and alternatives

As hotter summers become the norm, home aircon can feel increasingly tempting. We put six units to the test for cooling power, noise and energy use – and explain what you need to know before buying• How to sleep in a heatwave• Can air conditioning be green?Tell people you’re testing air conditioning, and the truth soon comes out: far more people have aircon than you’d ever imagine. It’s a guilty secret, the home improvement equivalent of Botox or weight loss jabs – everyone notices the results, but nobody admits to the method. Most portable aircons are in bedrooms, hidden away