AC Electricity Consumption- Complete Guide to Power Usage, Units & Cost (1 Ton, 1.5 Ton, 2 Ton AC)

Today, air conditioners have become a necessity in almost all households in India, especially in peak summer seasons when the temperature crosses 40° Celsius. Though air conditioners provide us with much-needed relief, we cannot overlook the fact that they have a significant impact on our electricity bills. In fact, research has revealed that air conditioners contribute to almost 39% of the total electricity consumption in our households in peak summer seasons.

Learning about the electricity consumption of air conditioners can help you make smart decisions, whether it is to purchase the right tonnage, compare the star ratings of different air conditioners, or use your air conditioner in a smart manner. In this article, we have included information regarding the power consumption of air conditioners, their formula, and much more.

How to Calculate AC Power Consumption

It is quite easy to calculate the power consumption of an air conditioner. You just need a few details.

Basic Formula-

Power Consumption (kWh) = Wattage x Hours Used ÷ 1000

Example-

AC Wattage- 1500 watts (i.e., 1.5 Ton AC)

Usage- 8 Hours a Day

Calculation-

1500 x 8 ÷ 1000 = 12 kWh/day

Monthly Calculation-

12 x 30 = 360 kWh/month

Formula to Estimate Your Monthly AC Bill

To calculate your electricity cost-

Monthly Cost = Units Consumed × Cost per Unit

Example-

• Monthly Consumption- 300 units
• Cost per unit- ₹8

Total = ₹2400/month

You can also use a Smart NoBroker calculator to get calculations as per your AC tonnage/ wattage and hours of usage. 

Average AC Electricity Consumption by Type, Capacity, and Star Rating

The tables below provide an approximate idea regarding the electricity consumption by an air conditioner. The values may differ slightly according to the usage and conditions.

Split AC Electricity Consumption

Capacity	Star Rating	Daily kWh (8 hrs)	Monthly kWh
1 Ton	2 Star	7-8	210-240
	3 Star	6-7	180-210
	5 Star	5-6	150-180
1.5 Ton	2 Star	10-11	300-330
	3 Star	8-10	240-300
	5 Star	6-8	180-240
2 Ton	2 Star	14-16	420-480
	3 Star	12-14	360-420
	5 Star	9-11	270-330
2.5 Ton	2 Star	18-20	540-600
	3 Star	15-17	450-510
	5 Star	12-14	360-420
3 Ton	2 Star	22-25	660-750
	3 Star	18-21	540-630
	5 Star	14-17	420-510

NOTE:

• Higher Tonnage = Higher Consumption by the AC Unit
• Higher Rating = Lower Consumption by the AC Unit
• 5-Star AC saves up to 20-30% of electricity compared to a 2-Star AC

Window AC Electricity Consumption

Capacity	Star Rating	Daily kWh (8 hrs)	Monthly kWh
1 Ton	2 Star	8–9	240–270
	3 Star	7–8	210–240
	5 Star	6–7	180–210
1.5 Ton	2 Star	11–13	330–390
	3 Star	9–11	270–330
	5 Star	7–9	210–270
2 Ton	2 Star	16–18	480–540
	3 Star	13–15	390–450
	5 Star	10–12	300–360
2.5 Ton	2 Star	20–22	600–660
	3 Star	17–19	510–570
	5 Star	13–15	390–450
3 Ton	2 Star	24–27	720–810
	3 Star	20–23	600–690
	5 Star	16–19	480–570

NOTE:

• Generally, Window ACs have a higher air conditioner power consumption compared to Split ACs
• A 5-Star Window AC is still a great choice to save a considerable amount of electricity
• Ideal for smaller rooms and budget setups

If you want a more detailed breakdown based on capacity, you can explore our guides on 1 ton AC power consumption, 1.5 ton AC electricity usage, and 2 ton AC power consumption.

You can also compare efficiency levels in detail through our 3-star vs 5-star AC power consumption guide to understand long-term savings. 

And if you’re considering a different AC type, don’t miss our detailed guide on window AC power consumption to understand how it compares with split ACs.

Additional Insights on AC Electricity Consumption

Apart from capacity and daily usage, other factors such as the type of AC and star rating also play a major role in determining the overall electricity consumption for the AC unit. For instance, split ACs are more efficient for long-term usage, while window ACs are more cost-effective with slightly higher electricity consumption. You can read more in our Window AC vs Split AC electricity consumption guide. 

Similarly, the star rating also has a direct effect on the efficiency of the AC unit, 3-star AC’s are more cost-effective with slightly higher electricity consumption, while 4-star ACs have a balanced effect with respect to cost and efficiency, and 5-star ACs have the lowest electricity consumption with a slightly higher cost. When it comes to coolers versus ACs for cooling purposes, coolers consume relatively lower electricity compared to ACs due to the usage of compressors; however, coolers have less consistent cooling. Read more in our AC vs cooler electricity consumption guide.

Factors Affecting AC Electricity Consumption

Your AC electricity consumption does not depend only on the tonnage of your AC; it is affected by many real-life factors that actually influence the working of your AC.

Key Factors-

• Room Size and Ceiling Height- If the room is larger or the ceiling is higher, the cooling requirement will be higher, thereby increasing the power consumption of the AC.
• Star Rating and Energy Efficiency- A higher-rated AC uses less power for the same cooling effect. For instance, a 5-star-rated AC may cost more but will save money on AC electricity consumption.
• Usage Duration- The longer your AC operates, the higher your AC electricity consumption will be.
• Temperature Setting- If your AC temperature is set too low, for example, at 18°C, it will consume more power than if it is set between 24°C and 26°C.
• Insulation and Room Sealing- If the insulation is not proper or the doors and windows are not sealed well, or the direct sunlight is falling on the AC, it causes the cool air to leak out from the AC, thereby increasing the consumption of the AC units.
• Type of AC (Inverter vs Non-Inverter)- Inverter AC units consume less power compared to non-inverter AC units that run on a start-stop cycle.
• Maintenance and Servicing– If the AC is not serviced properly, it may consume more power by not running the AC optimally.
• Outdoor Temperature and Climate- On extremely hot days, your AC has to work harder to maintain a set temperature, which results in increased power consumption.
• Age of AC Unit- Old AC units are less efficient compared to newer ones. This results in increased power consumption compared to newer AC units.
• Installation Quality- Poorly installed AC units, such as incorrect gas charging or incorrect placement, may increase power consumption.

Tips to Reduce AC Electricity Consumption

It is not necessary to compromise comfort to reduce your AC electricity consumption. You can easily maintain your comfort and reduce electricity consumption at the same time.

Practical Tips:

• Set the Temperature to 24-26°C- This is the best temperature to maintain comfort and reduce electricity consumption at the same time. If you set the temperature too low, your AC will work harder to maintain the low temperature, and electricity consumption will increase.
• Use Sleep Mode at Night- Sleep mode will adjust the temperature according to the room’s condition, and your AC will work more efficiently, reducing electricity consumption.
• Schedule Regular Servicing- Regular servicing will increase the efficiency of your AC, and electricity consumption will be lower.
• Seal Your Doors and Windows- Sealing your doors and windows will prevent the loss of cool air, and your AC will work more efficiently, reducing electricity consumption.
• Use curtains, blinds, or window films- This will ensure that the room is not exposed to direct sunlight, hence regulating the room’s temperature and reducing the workload of the AC to cool the room.
• Switch to an inverter AC- The inverter AC has the advantage of regulating the speed at which the compressor operates, hence providing stability and saving electricity in the long run.
• Avoid frequent ON/OFF cycles- This will save you electricity because the more you switch the AC on and off, the more power is consumed because the compressor will work harder to start.
• Use a fan and AC- The fan will assist in the even distribution of cold air, hence allowing you to increase the room’s temperature without compromising comfort.

For more detailed information, check out How to Reduce AC Bill. 

Common Myths About AC Electricity Usage

There are a number of common myths about AC electricity usage that usually end up increasing electricity bills rather than reducing them. Let’s debunk some of these common myths about AC electricity usage:

Myth 1: Lower temperature cools the room faster

AC electricity usage is a common myth, as ACs are made to cool the room at a constant rate, irrespective of the temperature setting. Therefore, setting the AC to 18°C doesn’t make the AC cool the room faster; rather, it increases AC electricity usage.

Myth 2: Turning AC on and off frequently saves power

AC electricity usage is another common myth that usually has no basis in reality, as each time the AC starts running after being switched off, it increases AC electricity usage.

Myth 3: Bigger AC always cools better

AC electricity usage is a common myth, as a larger AC cools the room too fast and doesn’t remove sufficient moisture from the air, resulting in discomfort.

Myth 4: Fan mode consumes the same electricity as cooling mode

AC electricity usage is a common myth, as the fan mode doesn’t use the compressor; hence, AC electricity usage is minimal in fan mode as compared to cooling mode.

Myth 5: Keeping AC at a constant low temperature

Keeping the AC at a very low temperature will increase power consumption. A moderate temperature of 24-26°C is much more efficient.

FAQ’s

1. How much electricity does a 1.5 ton AC consume?

Ans. 1.5 ton AC usually consumes 8-10 units of electricity per day depending upon the working hours and rating of the AC.

2. Does inverter AC save electricity?

Ans. Yes, inverter ACs save a considerable amount of electricity by varying the speed of the compressor according to the required output.

3. What is the ideal AC temperature to save electricity?

Ans. The ideal temperature of an AC should be between 24-26 degrees to save a considerable amount of electricity.

4. How many units does AC consume in 8 hours?

Ans. AC usually consumes 6-12 units of electricity in 8 hours depending upon its capacity and rating.

5. Does fan speed affect AC consumption?

Ans. Fan speed is of no concern, but the compressor is responsible for consuming a huge amount of electricity.

6. Is a 5-star AC worth buying?

Ans. Yes, a 5-star AC is worth buying, as it saves a huge amount of electricity and reduces the electricity bill in the future.

7. Do old ACs consume more electricity?

Ans. Yes, old ACs consume more electricity.

8. How can I reduce my AC electricity bill?

Ans. You can reduce your AC electricity bill by setting the temperature optimally, maintaining the AC properly, and making the best use of the AC.

9. Does the room size affect the consumption of the AC?

Ans. Yes, the larger the room size, the higher the consumption of the AC.

10. Which device uses more electricity: AC or cooler?

Ans. The AC uses more electricity than the cooler.

11. Is it cheaper to run the AC the whole night?

Ans. It depends upon the temperature and insulation; otherwise, it is a good idea to make the best use of the AC.

12. How often does the AC need to be serviced?

Ans. The AC needs to be serviced every 3-6 months.

13. Does the inverter AC run continuously?

Ans. Yes, it runs continuously but at varying speeds, thereby reducing the consumption of the AC.

14. What is the consumption of the AC during the standby mode?

Ans. It is the consumption of the AC when it is plugged into the power source but not running.

15. Which AC is the most energy-efficient?

Ans. The inverter split AC with the higher number of stars is the most energy-efficient AC.