What is the most fuel-efficient temperature to set the car air conditioning in summer?

[LeGia]

Setting the car air conditioning to 26 degrees Celsius in summer is the most fuel-efficient. Directing the vents upward can cool the car quickly: Many friends feel that pointing the air vents directly at themselves makes them feel the coolest, but this actually prevents the overall temperature inside the car from dropping. Since hot air tends to rise and accumulate near the roof, directing the vents upward allows the cold air to rise, which helps lower the cabin temperature more quickly. Once the temperature drops, reducing the fan speed will naturally save fuel. It's best to alternate between recirculation and fresh air modes: When first turning on the air conditioning, start with the fresh air mode to expel stale air from the cabin. After the temperature has dropped, switch to recirculation mode to cool the interior faster. Alternating between these modes not only saves fuel but also enhances the driving experience.

[DelTeagan]

With over twenty years of experience in automotive repair, I've found that setting the air conditioning to 24°C in summer is the most fuel-efficient. The compressor operates intermittently within this temperature range with minimal load, significantly reducing engine strain and fuel consumption. If the temperature is set below 22°C, the compressor runs continuously, increasing engine energy consumption; above 26°C, cabin comfort decreases, and frequent AC cycling becomes inefficient. When the AC system operates efficiently, fuel consumption can drop by about 10%. Regular maintenance—such as cleaning the condenser and replacing filters—is recommended to ensure optimal performance. Combining this with automatic fan speed mode allows the compressor to rest appropriately. Additionally, opening windows for ventilation for a few minutes before closing them and turning on the AC can reduce initial load. Remember these tips to save fuel and extend your vehicle's lifespan—a win-win.

[NevaehLee]

As a cost-conscious car owner, experiments have shown that setting the air conditioning between 23-25°C in summer yields the lowest fuel consumption. Setting the temperature too low forces the compressor to work at full capacity, potentially doubling fuel costs. Maintaining an appropriate temperature keeps the engine running smoothly, saving over 15% in fuel consumption. By using a fuel-tracking app to record data and setting this temperature range, I save dozens of yuan monthly. Avoid immediately setting the AC to the lowest temperature; it's best to let the engine idle for a few minutes after starting before turning on the AC. Combining this with driving habits like avoiding traffic congestion, opening windows for ventilation at low speeds, and reducing AC load can further improve efficiency. Regularly checking the AC system for refrigerant leaks also enhances performance. Saving fuel isn't complicated—it's all about proper settings and routine maintenance.

[Chiron]

After driving for forty years, my experience is that setting the air conditioning at a fixed 24°C in summer is the most fuel-efficient. If the temperature is set too high, it won't be cool enough; if set too low, the compressor will overwork, causing fuel consumption to skyrocket. Start the vehicle and drive for two minutes before turning on the air conditioning to let the engine stabilize. The automatic fan speed mode helps the compressor rest and reduces energy consumption. Avoid setting the temperature too low, as it can easily lead to excessive fuel consumption and discomfort due to large temperature differences inside the car. Simple settings save fuel and protect vehicle components.