Running Air Conditioner on Low Fan Speed Actually Uses More Electricity! 'Expert Confirms 1 Button' Saves Significant Electricity Bills, Cools Faster, and Bills Are Noticeably Reduced

As summer temperatures continue to rise, air conditioners have become an essential appliance running all day in almost every household. To avoid skyrocketing electricity bills, many people habitually adjust the fan speed to 'low,' believing that the lower the fan speed, the more energy-efficient it is. However, Japanese financial media 'Financial Field' interviewed experts who pointed out that this practice could backfire. The key to high electricity consumption when running an air conditioner is not the indoor fan but the outdoor unit's compressor, and blindly setting it to low fan speed may actually increase electricity bills.

Why does running the air conditioner on low fan speed consume more electricity?

Many people intuitively believe that low fan speed uses less electricity, which is true for the indoor fan but has a negligible impact on the total electricity consumption of the entire air conditioner.

The main electricity consumption of an air conditioner lies in the 'compressor' responsible for regulating temperature. When the indoor unit is just turned on and the room temperature is still high, if it is directly set to low fan speed, the dissemination of cold air throughout the room will be significantly slowed down. This will cause the space to take longer to reach the set temperature, forcing the outdoor unit's compressor to maintain high-power operation for an extended period. Ultimately, the total electricity consumption turns out to be more than expected.

How should the air conditioner be set for the most energy-efficient cooling? The 'auto run' mode is highly recommended.

Most air conditioner manufacturers recommend setting the fan speed to 'auto run' mode. In this mode, the air conditioner will detect the current room temperature and humidity through internal sensors and automatically run at high speed initially to quickly circulate cold air and shorten the cooling time.

Once the indoor temperature reaches the set temperature, the system will automatically reduce the fan speed to maintain a constant temperature. Compared to manually fixing it at low fan speed, the auto run mode can more intelligently allocate power, avoid unnecessary energy waste, and balance comfort and energy efficiency.

Should the air conditioner be turned off for short absences? Frequent switching consumes more electricity.

In addition to fan speed settings, daily usage habits are also key to electricity bill costs. Experts remind that if you are only briefly away (e.g., within 30 minutes), there is no need to deliberately turn off the air conditioner.

Because when the air conditioner is restarted and the room temperature is changed from hot to cold in the initial stage, the compressor needs to consume a large amount of electricity to cool down. In contrast, keeping the air conditioner running continuously in a constant temperature state sometimes consumes less electricity than repeatedly turning it on and off.

Improve cooling efficiency with circulation fans and regular filter cleaning.

If you want to further optimize the energy efficiency of your air conditioner, the following two daily maintenance and usage habits are equally important:

Regularly clean the filter. If the filter is clogged with dust, it will seriously obstruct air circulation, causing the air conditioner to consume more electricity to achieve the expected effect. It is recommended to clean the filter every two weeks to effectively improve operating efficiency.

Use a fan or circulation fan together. Since cold air has the characteristic of descending, using a fan or circulation fan together when using the air conditioner can promote indoor air circulation and disperse the cold air accumulated at the bottom to the entire space. In this way, even if the set temperature of the air conditioner is slightly increased, the perceived coolness can still be maintained, achieving the goal of energy saving.