Many motorists remain unaware that a simple button on their dashboard could dramatically reduce fuel usage during sweltering conditions. As Scotland braces for a heatwave with temperatures predicted to reach 28°C, drivers are reaching for their air conditioning controls. However, consumer expert Harry Kind revealed that using the air recirculation button can prevent the air conditioning system from being overwhelmed by hot air entering from outside, thereby cutting fuel costs.
How the Recirculation Button Works
The recirculation button, marked by a small arrow alongside an icon showing the interior of a car, cuts off outside air and cycles the air already inside the vehicle. This technique is highly efficient for cooling the cabin, even without the air conditioning running. It also benefits hayfever sufferers by preventing pollen from entering through the vents.
Expert Advice on Fuel Efficiency
Appearing on BBC Morning Live, Harry Kind explained that driving with windows down at high speeds increases drag, which is bad for fuel economy. He recommended using air conditioning in recirculation mode to keep costs down. He said: "If you're going slowly, your air con is probably going to use a lot more fuel, so it would be worth opening the windows on a hot day through a city to get rid of the hot air inside. If you are going to use air con, use the recirculation mode."
Tips for Maximum Cooling and Savings
The RAC advises running the air conditioning briefly to cool the cabin, then switching to recirculated air. Once the air conditioning is blowing cold, close all windows and switch to pre-cooled recirculated air. Opening upper air vents and adjusting flow as required can maintain comfort. This method reduces the power needed to cool the vehicle, saving fuel or battery charge.
Speed Reduction Saves Fuel
Harry Kind also encouraged motorists to reduce speed on motorways. He stated: "The Department for Transport says that going down from 80 to 70 miles per hour saves you 25 per cent on your fuel. Then when you go down from 70 to 60, that will save you about 9 per cent." Consistent driving without constant braking, ideally using cruise control, further enhances fuel efficiency.
Scotland's Heatwave Forecast
STV weatherman Sean Batty reported that the "best spell of the Scottish summer" could be imminent, with temperatures rising to 20°C in Perth, eastern Fife, and Edinburgh. Weather models suggest highs of up to 28°C along the Moray coast, around Glasgow, the Borders, and East Lothian. Drivers are encouraged to use the recirculation button to stay cool without excessive fuel consumption.
