Drivers urged to use obscure fuel-saving button to keep car cool and save money

However, there are times the air-recirculation button should definitely be turned off.

This includes when it’s cold outside. Recirculating hot air with this button in the winter is less effective, will make the car cooler, and potentially cause windows to fog up.

When should you not use the air-recirculation button?

If it is humid

The button traps humid air inside the car, which can mist up windscreens – potentially posing a safety risk.

This dangerous because it limits visibility but also because added humidity can make the car stuff and the driver drowsy.

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