Our motoring editor answers your questions on keeping cool with your car’s air conditioning unit without draining your battery "Regular maintenance ensures the air conditioning runs efficiently." Image: Getty In a petrol or diesel car, the AC system is like a miniature refrigerator on wheels: hot air gets sucked in, is cooled down by refrigerant and then blown back out as a chilly breeze to keep you cool on the road. Yes Running the AC in your car makes the engine work harder, burning more fuel.
Estimates suggest it can increase fuel consumption by 10pc to 20pc. Yes. The process and the end result are the same, but the energy source is different.
Instead of relying on an engine-driven compressor, EVs use an electric compressor, powered by the vehicle’s battery, so running the AC can reduce your range especially on sweltering days. At lower speeds, driving with the windows down may be more efficient. At higher speeds, the increased aerodynamic drag from open windows can make using the AC more efficient.
Roll down the windows and turn the AC on high for a few minutes to expel hot air, then roll the windows up and switch to recirculation mode. If you are worried about your AC using too much fuel, here are some handy tips: Top tip: Regular maintenance ensures the air conditioning runs efficiently and ensures the system is not using more fuel than it needs to. Servicing helps you stay cool and conserves petrol too.
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