Why 24°C Is the Ideal AC Temperature for Indian Homes: Save Energy, Stay Comfortable

Air conditioners are a common feature in many Indian homes, especially during the long, harsh summers. With rising temperatures and longer heat waves, cooling has become more of a necessity than a luxury. But what many people don’t realise is that the temperature you set on your AC can make a big difference not just to your comfort, but also to your electricity bill and the lifespan of the appliance. This blog explores why 24°C is considered the ideal AC temperature in India and how it benefits you in more ways than one.

Why AC Temperature Matters

The temperature setting of your air conditioner directly impacts its performance, energy consumption, and cooling efficiency. Many users tend to set their AC at the lowest possible temperature, thinking it will cool the room faster. In reality, this only makes the appliance work harder and longer, leading to increased electricity bills and unnecessary wear and tear. An overly cold indoor environment also causes discomfort and health issues like headaches, colds, and joint pain. Choosing the right temperature, therefore, helps maintain a balance between comfort, health, and cost.

What Is the 24°C Rule?

The 24°C rule is a recommendation put forward by the Bureau of Energy Efficiency (BEE), under the Ministry of Power in India. According to the BEE, setting your AC to 24 degrees Celsius is the most energy-efficient and comfortable choice for Indian households. This standard has gained popularity over the years and is now seen as the "ideal" setting. It is based on studies related to thermal comfort, energy efficiency, and environmental impact. The government even launched awareness campaigns to encourage people to adopt this practice, which helps reduce power consumption across the country.

The Science of Cooling Efficiency

An air conditioner works by removing heat from the air and releasing cool air into the room. It operates based on a thermostat-controlled compressor. When the set temperature is reached, the compressor switches off. When the room warms up again, the compressor restarts. Lower temperature settings, such as 18°C, make the compressor work continuously for longer periods, increasing energy consumption and reducing efficiency. At 24°C, the compressor functions in a more balanced cycle. It doesn’t need to work as hard or as often, which results in smoother operation and better energy efficiency.

Why 24°C Is the Ideal Setting

Energy Efficiency

Setting your AC to 24°C is one of the simplest ways to reduce energy usage. When the temperature is too low, the AC consumes more power to reach and maintain that level. At 24°C, the compressor works optimally without overloading. This means the appliance cools the room adequately while using less energy. Over time, this setting can lead to significant savings on your electricity bill. The less strain placed on the system, the more efficient and long-lasting it becomes.

AC Load and Compressor Operation

At 24°C, the AC maintains a moderate load. This reduces the number of times the compressor turns on and off, which is known as short cycling. Frequent cycling not only uses more electricity but also wears down the compressor faster. By operating in a stable cycle, the AC can maintain a comfortable room temperature with minimal power use and mechanical stress.

Unit Comparison

When comparing different temperature settings, the power difference becomes clear. A 1.5-ton 5-star AC set at 18°C can consume up to 1.5 kWh of power per hour, while at 24°C, it may use only 1.0 kWh. Over hours of daily use, this difference adds up. Not only is 24°C energy-efficient, but it also offers adequate cooling without overburdening the system.

Optimal Comfort for Most People

Comfort isn’t always about the coldest air. Studies show that most people feel comfortable in a temperature range of 23–26°C with 45–55% humidity. Setting the AC to 24°C maintains this range, making it suitable for daily living and sleep. Unlike extreme settings, 24°C feels natural and comfortable to the body.

Reduced Temperature Shock

Another reason to avoid very low temperatures is the shock your body experiences when moving between environments. If your room is set to 18°C and the outdoors is above 35°C, the sudden contrast can lead to chills, fatigue, or even colds. A 24°C indoor setting eases this transition and reduces thermal discomfort, especially for children and older adults.

Improved Appliance Longevity

Lower temperature settings force the AC to work longer, increasing its operational cycles and mechanical stress. This affects components like the compressor, fan motor, and capacitor. At 24°C, the AC operates in a stable pattern, reducing unnecessary cycling and mechanical wear. This helps extend the appliance’s life and reduces the chances of technical faults.

Lower Risk of Ice Formation or Overcooling

In regions with high humidity, very low AC settings can cause ice to form on the coils. This blocks airflow and reduces the effectiveness of cooling. Over time, it may lead to water leakage or damaged coils. A 24°C setting keeps the coils at a safe temperature, avoiding such issues and ensuring efficient performance.

Power Consumption at Different Temperatures

How Much Power Does an AC Use?

The power consumption of an AC depends on its tonnage, star rating, and usage duration. On average, a 1.5-ton 3-star AC running at 18°C for 8 hours a day can consume about 12 kWh per day. At 24°C, this consumption drops to around 8 kWh. Over a month, this difference can lead to significant energy savings.

Electricity Bill Comparison

Assuming an average electricity cost of ₹8 per unit, the difference becomes more evident. At 18°C, your daily running cost could be ₹96, adding up to ₹2,880 per month. At 24°C, the daily cost may be ₹64, which totals around ₹1,920 per month. This is especially true for high-efficiency models like 5-star ACs, where energy savings are more pronounced when used at optimal settings. 

How to Maintain Comfort at 24°C

Use Ceiling or Pedestal Fans

Fans help improve air circulation, which enhances the cooling effect. When the air moves, it feels cooler even at higher temperatures. Using a fan alongside your AC allows you to maintain comfort at 24°C without needing to reduce the temperature setting.

Block Sunlight

Rooms that receive direct sunlight tend to heat up faster. Installing curtains, blinds, or reflective films can block heat and reduce indoor temperatures. This lowers the cooling load on your AC and keeps your room naturally cooler. By reducing the heat entering your space, you make it easier for the AC to maintain 24°C efficiently.

Limit Indoor Heat Sources

Electrical devices such as TVs, laptops, and lights generate heat. Turning them off when not in use helps maintain a cooler room environment. Cooking during cooler parts of the day, especially in homes with open kitchens, also reduces additional heat. These simple actions can support the efficiency of your AC at 24°C.

Seal the Room Properly

Cool air tends to escape through gaps in windows or doors. Proper sealing using weather strips or insulation tape can prevent air leakage. A well-sealed room retains cool air longer and allows your AC to operate more effectively. This ensures a steady temperature with less energy use.

Install a Programmable Thermostat or Smart Plug

Smart thermostats and plugs help automate your AC’s settings. You can schedule the AC to run at specific times or turn off after a certain period. This avoids unnecessary usage and maintains a steady 24°C without manual adjustments. Over time, these tools contribute to energy savings and convenience.

Ideal Settings for Different Scenarios

Bedrooms

For a good night’s sleep, 24°C combined with sleep mode or a fan offers ideal comfort. Sleep mode gradually adjusts the temperature, preventing excessive cooling at night. This setup ensures you stay comfortable while reducing energy consumption during sleep.

Living Rooms

In living areas with multiple occupants, 24°C to 25°C works best. It maintains a neutral temperature that suits everyone. With fans or cross-ventilation, you can keep the environment comfortable without needing a lower setting.

Homes with the Elderly or Babies

Both older adults and infants are sensitive to temperature extremes. Setting the AC to 24°C keeps the room comfortable and safe for them. It avoids health issues related to chills or dehydration, providing a balanced indoor environment.

High Humidity Areas

If you live in a coastal or humid region, using dry mode at 24°C can be more effective. Dry mode removes excess moisture while maintaining a cool temperature. This setting is energy-efficient and ideal for high-humidity days.

Additional Tips for Efficient AC Use

Clean Filters Regularly

Dirty filters block airflow, forcing your AC to work harder. This increases energy use and reduces cooling performance. Cleaning or replacing filters every two weeks helps maintain efficiency and prolongs the life of the AC.

Use Sleep Mode at Night

Sleep mode raises the temperature slightly over time. This ensures you remain comfortable while using less power. It's a simple feature that can save you hundreds of rupees each month during summer.

Don’t Switch Between Cool & Fan Mode Frequently

Switching between modes frequently puts pressure on the compressor. It disrupts the AC’s normal cycle and leads to temperature fluctuations. Instead, use one mode consistently or combine cool mode with a fan for better results.

FAQs 

Q1. Is 24°C too warm for Indian summers?

Not at all. When used with a fan or proper insulation, 24°C provides effective cooling and comfort even on the hottest days.

Q2. Will increasing the temperature reduce humidity?

Raising the temperature alone won’t reduce humidity. Use dry mode if you want to remove moisture from the air effectively.

Q3. Does an inverter AC behave differently at 24°C?

Yes, inverter ACs adjust their speed based on the room temperature. At 24°C, they operate at lower speeds, which saves energy and maintains consistent cooling.

Conclusion

Choosing 24°C as your default AC setting is a smart and responsible choice. It provides a balance between comfort, efficiency, and sustainability. You save money on your electricity bill, protect your AC from early damage, and reduce your carbon footprint. This small adjustment in your daily routine can have a large impact over time. So the next time you turn on your AC, remember 24°C is not just a number. It's the smart setting for your home, your health, and your wallet.