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Is it better to cool your house all day, or adjust the A/C setting on your way out the door? Westend61 via Getty Images

Does turning the air conditioning off when you’re not home actually save energy? Three engineers run the numbers

Energy modeling software provides insight into whether letting your A/C relax while you’re gone all day will save you energy – and money.
Getting heat from people underground to those above ground is not an easy task. Sean Dempsey/PA

How to use the London Underground to heat your home

Any traveller on the London Underground during the summer will know how hot and stifling it can get. That the Tube can be hotter than Bali or Barcelona is a fact of life for commuters. Running trains in…

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