Ben Gallizzi, energy expert at Uswitch.com, told FEMAIL: 'Cooking in a conventional oven is one of the most common ways to prepare dinner, but it is often more expensive to run than other kitchen appliances.'Ovens are usually large enough to cook multiple dishes at the same time, so there's a lot of energy being wasted if you're only cooking on one shelf.'Air fryers are much more efficient as they tend to be smaller than ovens, and their quicker cooking time means they use less energy overall.
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