No central AC? As the National Weather Service warns of dangerous heat across much of the US next week, we tested dozens of air conditioner units to see which delivers the best cooling performance.

As summers in the UK get hotter, is it time for air conditioning to become a permanent feature in most homes?

The products or services listed have been independently tested by our journalists. We earn a commission from the affiliate links in this article. Read more > Much like British people, our houses ...