Knowing to Avoid Wasting Air Conditioning Electricity

During the hot summer months, using air conditioning becomes essential for households. This also means that monthly electricity bills will rise significantly. So how can you quickly cool your space while saving on electricity when using an air conditioner? Try these electricity-saving tips below.

Upon entering your bedroom, you set the air conditioner to a chilly 16^oC, hoping for a quick cool down. However, this action leads to unnecessary electricity consumption! This article will help you avoid wasting money on such practices.

How Do Air Conditioners Consume Electricity?

An air conditioner has four main components: the compressor located at the outdoor unit (which consumes the most electricity, accounting for about 95% of the total power of the air conditioner); the cooling fan installed at the outdoor unit; a circulation fan inside the room; and the air direction motor located at the indoor unit. Common air conditioning units today are equipped with a relay that automatically turns off the outdoor unit when the room reaches the desired temperature. The circulation fan in the indoor unit runs continuously at varying speeds depending on user preference. The air direction motor operates or stops based on user settings as previously mentioned.

In terms of operation, there are two types of air conditioners: conventional and inverter air conditioners.

Conventional air conditioners typically consume a relatively high amount of electricity and have a shorter lifespan due to frequent restarts during continuous use. Additionally, the room temperature will fluctuate significantly (±2°C).

For example, if the air conditioner is set to 24°C, all components will run until the room temperature reaches approximately 22°C – 24°C, at which point the outdoor unit will automatically shut off. After a certain period, depending on the thermal exchange between the room and the surrounding environment, the room temperature gradually rises to 24° – 26°C, prompting the outdoor unit to restart and cool the room back down to the desired level. The temperature fluctuation of ±2°C around the set temperature of 24°C is due to the inertia of the unit’s operation; for instance, when the sensor detects that the room has reached 24°C, it sends a stop signal, but the cold air from before continues to lower the room temperature. Similarly, when the room temperature exceeds 24°C, the compressor will restart, but it takes some time to produce cold air, during which the room temperature increases.

Regular maintenance of air conditioners is necessary, approximately every 6 months. The air filter should be cleaned more frequently to prevent dust buildup. (Image: NT)

Inverter air conditioners utilize modern control technology that allows the compressor to operate at gradually increasing power until the desired room temperature is achieved. The machine’s power is then adjusted downward, operating at a moderate level to compensate for heat generated in the room (from electrical devices, body heat, etc.) and heat from outside through walls and doors. This power will increase or decrease based on the difference between the room temperature and the set temperature for the air conditioner. Due to this control method, inverter air conditioners can save between 30% to 50% more electricity compared to conventional units. However, to achieve these savings, the air conditioner must be used under certain conditions as outlined below.

It is also worth noting that because inverter units are equipped with newer technologies than conventional models, they typically cost 30% to 50% more.

Optimal Temperature Settings

Air conditioners operate efficiently only when the temperature around the outdoor unit is below 48°C and the indoor temperature is above 19°C. Violating these limits will lead to inefficient operation due to very low heat dissipation capabilities.

When starting the air conditioner, you should only set the desired cooling temperature, then activate the quick cooling function indicated on the remote control, which essentially increases the speed of the circulation fan in the indoor unit. Avoid setting the temperature at the lowest setting as this will not help achieve the desired temperature faster; instead, it will waste electricity since the unit must run until it reaches the lowest temperature before shutting off.

To use the air conditioner efficiently, it is advisable to select a moderate temperature. The ambient temperature that the human body adapts to is around 25 – 27°C. Therefore, setting the temperature to 26°C ensures comfort while saving electricity. Whether the air conditioner reaches the temperature indicated on the remote depends on the temperature sensor located in the indoor unit, which typically does not fluctuate over time. Thus, in the case of older units, even if you set it to 24°C, the room can still reach that temperature, but it will consume more electricity.

Proper Installation

Choosing the right installation location for your air conditioning system can help save electricity. The outdoor unit should be installed in a well-ventilated area, away from direct sunlight that could raise the unit’s temperature. In windy areas, it is advisable to position the cooling fan perpendicular to the wind direction. This will enhance the unit’s heat dissipation capabilities. Make sure not to install the outdoor unit in areas with heat sources, smoke emissions, or corrosive chemicals.

The height difference and distance between the indoor and outdoor units should be arranged reasonably and kept as short as possible to save both material costs and electricity consumption. For conventional air conditioners, the length of the refrigerant piping should not exceed 5 meters, and the height difference should not exceed 3 meters. Exceeding these specifications will significantly decrease the cooling efficiency of the system.

The air conditioner should ideally be installed at a height of 1.7 meters above the floor. This is because the air intake of the unit is usually located in the upper half and the air outlet in the lower half. If the unit is installed too high, the cool air will not descend but will be drawn back into the unit. Conversely, if installed too low, while the room will cool down immediately upon activation, it may lead to back discomfort for occupants.

If your room has an exhaust fan to enhance air exchange, remember to place the fan high and not close to the air conditioner to ensure it does not draw the cool air outside, causing the unit to work harder and consume more electricity, as cold air tends to settle down. The best location for the exhaust fan is high up and opposite the air conditioner.

Do Not Place Objects Around the Outdoor Unit

Do not place anything around the outdoor unit; ensure it remains clear. (Image: Aboluowang).

If there are potted plants, buckets, packaging, or rags around the outdoor unit, the hot air expelled during the heat exchange process will not dissipate, leading to wasted electricity. Therefore, do not place items around the outdoor unit; ensure it remains clear.

Additionally, selecting an appropriately sized air conditioner for the room, sealing windows, and using curtains in the window areas can also help reduce the electricity load on the air conditioner.

Reduce Other Devices, Prioritize the Air Conditioner

To save electricity, you need to be aware of the power consumption of each device in your home. During the summer months, air conditioning consumption often accounts for one-third, or even half, of the total electricity consumption of the household. Electricity bills are calculated cumulatively; the more you use, the more they spike.

You can still enjoy comfort if you are mindful of reducing consumption from other devices. For instance, limit the amount of food stored in the refrigerator so it doesn’t have to run frequently. Cooking simple meals in the heat saves time and reduces the use of electric stoves, making it less tiring. Other devices like ovens, yogurt makers, especially dryers, water heaters, and TVs can also be minimized during this season.

Moreover, electricity usage peaks in the morning and evening when family members return home. By understanding your family’s lifestyle, you can also lower your electricity bill.

Energy Saving Tips for Air Conditioner Use

In the air conditioning unit, there are two sets of fins that help direct cold air in desired directions. Users should adjust the air fins so that the cold air is concentrated in the areas that need cooling the most.
Always turn off the air conditioner when it is not in use. If you won’t be using it for a long time, it is advisable to turn off the entire unit (circuit breaker) because simply turning it off with the remote still allows for phantom electricity consumption, and for safety reasons. The air conditioner should be cleaned regularly, approximately every six months. The air filters should be cleaned more frequently to prevent dust buildup.

Rearranging furniture to avoid blocking airflow

Turn off unnecessary lights to facilitate faster cooling. Avoid turning the unit on and off too frequently, as restarting consumes more energy, so maintain a stable temperature instead.
If you use a fan in conjunction with a bowl of cool water, it will enhance the cooling efficiency as the fan helps circulate the cool air in the room.
If you are not leaving home for too long, it is best not to turn off the air conditioner. Instead, raise the temperature to the highest setting (30 or 32 degrees Celsius) and close all windows and curtains. Keeping the room covered will prevent sunlight from entering and raising the room temperature excessively. Upon return, you may feel warmth for a few minutes, but it shouldn’t be enough for your air conditioner to have to restart cooling from scratch. There are also blackout curtains available that help block direct sunlight, keeping the temperature down while preventing indoor air from escaping.
Although air conditioners have louvered vents to direct cool air to the needed areas, it is advisable to keep furniture organized to avoid obstructing airflow, allowing you to feel cooler faster and consume less electricity.
Set the room temperature appropriately: A temperature range of 23 to 27 degrees Celsius is ideal for optimal air conditioner performance, balancing energy consumption while maintaining a comfortable temperature (with minimal difference between indoor and outdoor temperatures). The Cool Biz campaign initiated by Japan’s Ministry of the Environment in 2005 recommends setting the room temperature at 28 degrees Celsius. If you’re still feeling warm, using a fan will help alleviate that quickly. A temperature of 28 degrees Celsius is confirmed to improve blood circulation, skin health, reduce hair loss, and enhance productivity. For homes with infants and children under 36 months, the suitable temperature range is 28-30 degrees Celsius, providing a cool environment that does not impact their respiratory health.
Do not turn off the air conditioner if you will be away for a short time: It is best to raise the air conditioner temperature to the highest setting (30 to 32 degrees) and close all windows and curtains. When you return, you may feel a bit warm for a few minutes, but the heat won’t be so intense that it requires the air conditioner to start cooling from the beginning.
Use a fan in conjunction with the air conditioner: While we use air conditioning for cooling, a fan helps circulate cool air throughout the room, meaning you won’t need to set the temperature too low, which saves electricity. Additionally, fans consume less power than air conditioners, so using both can significantly cut energy costs. Moreover, evaporative coolers are excellent cooling devices that you can use alongside your air conditioner to optimize cooling, ensuring health benefits while saving energy.
Choose the right capacity for your room: Selecting an air conditioner suitable for your room size is crucial. If you buy a unit with insufficient capacity, it won’t be able to cool a large area effectively, leading to continuous operation and higher energy consumption. Conversely, a unit that is too powerful for your space is wasteful. Additionally, the installation location affects the cooling performance, so it’s advisable to install the unit in well-ventilated areas away from direct sunlight to save energy.
Regular maintenance: To ensure the air conditioner operates well during hot seasons, users should clean and maintain the unit regularly. Moreover, to prevent device malfunctions, it is essential to choose reputable brands with quality products and good after-sales service. According to manufacturers, if the air conditioner in a household operates for only 6-8 hours a day, it should be cleaned every six months. For offices and restaurants, it is recommended to maintain it every three months. In production facilities and factories where the unit is continuously operational, monthly cleaning is advisable. Common signs that it’s time to clean include loud noises from the outdoor unit and water leakage from the indoor unit’s drainage pipe.
Avoid frequently turning the air conditioner on and off: When the air conditioner starts up, it consumes a significant amount of energy. Frequent switching will only lead to more electricity consumption. When first turned on, use the turbo or power mode (depending on the model) for rapid cooling, then switch back to normal mode once the room is cool. The temperature difference between the indoor and outdoor should not exceed 7-10 degrees Celsius. If you accidentally turn off the air conditioner, wait at least three minutes before turning it back on.
Pay attention to the air direction of the air conditioner: Gases expand when heated and contract when cooled. Warm air is lighter than cold air. Therefore, during summer, direct the air conditioning fan upwards so that the cold air circulates downwards. Alternatively, using a fan to circulate both hot and cold air in the room continuously can save about 2% more energy compared to using the air conditioner alone.
Use the sleep mode or timer to turn off the unit at night: Most modern air conditioners are equipped with a sleep mode that automatically adjusts the temperature, preventing users from waking up in the middle of the night due to excessive cold, while also saving energy. The SLEEP mode on the air conditioner remote will help you automatically set the cooling mode for sleep. Compared to the initial setting temperature when sleeping, the temperature will increase by 1°C after about 30 minutes to an hour, then continue to rise by another 1-2°C according to the settings on the remote and maintain that level until you turn off the air conditioner. The SLEEP mode helps balance the room temperature with the body temperature, providing the most comfortable sleeping environment.
Turn on the air conditioner before closing the windows: When turning on the air conditioner, close the windows to maintain cool air. However, it is best to turn on the air conditioner first to filter out pollutants and harmful factors before closing the windows.
Do not rush to turn on the air conditioner after entering the house: Many people hurriedly turn on the air conditioner as soon as they enter the house, which is not advisable! When outside in the heat, our blood vessels dilate. If we immediately turn on the air conditioner at a low temperature upon entering, it causes the blood vessels to constrict, which could lead to cardiovascular and cerebrovascular issues over time.