How Much Electricity Does a 1.5-ton AC Use

Understand the consumption of 1.5-ton ACs and how to reduce power consumption to save energy and costs. If you are looking to buy a new AC, get yours on Easy EMIs with Bajaj Finance.
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How Much Electricity Does a 1.5-ton AC Use
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3 min
19-Jan-2026

If you have ever wondered why your electricity bill goes up during summer, the answer often lies in the air conditioner. A 1.5 ton AC is one of the most popular choices for cooling medium-sized rooms, and models like the LG 1.5 ton AC are commonly chosen for their balanced performance and efficiency. Families prefer it for bedrooms, living areas, or even home offices because it manages cooling and energy use smartly. Did you know that a 1.5 ton AC can consume around 1.2 to 1.8 units of electricity per hour, depending on the model? This is why buyers often look for smarter financing options to upgrade without feeling the pinch.

With Bajaj Finserv, you can bring home your preferred AC—or any other appliance—without exhausting your savings. Visit one of the 11.5 lakh plus Bajaj Finserv partner stores in 4,000 cities in India, choose your favourite model, and use the Easy EMI Loan of up to Rs. 5 lakh to make the purchase. Convert the cost into Easy EMIs that match your monthly budget, and even enjoy zero down payment on select models. You can check your loan eligibility online within minutes, so you know exactly what you can buy before stepping into the store.

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What will be the 1.5 ton AC’s daily electricity consumption

The daily electricity consumption of a 1.5-ton 5 Star split AC depends on several factors, including:

  • Energy Efficiency Rating (EER or COP): Higher star rated ACs are generally more energy efficient.
  • Actual power consumption: This can vary depending on the specific AC model and can be found in the user manual or manufacturer's specifications.
  • Daily running hours: The longer you run the AC, the more electricity it will consume.
  • Room size and insulation: A well-insulated room will require less energy to cool than a poorly insulated one.

However, we can estimate the daily electricity consumption based on some assumptions:

  • Average Power Consumption: 1.5 kW (1500 watts)
  • Daily Running Hours: 8 hours

With these assumptions, the daily electricity consumption would be:

  • Daily consumption kWh = Power (kW) x Daily Running Hours (hours)
  • Daily consumption kWh = 1.5 kW * 8 hours = 12 kWh

Therefore, under these assumptions, a 1.5 ton AC would consume approximately 12 kWh of electricity per day.

What are the factors that affect AC power consumption

Here are the factors that affect the power consumption of a 1.5-ton AC:

1. Room size

  • Larger rooms require more cooling, so the AC has to work harder, increasing power consumption. Matching the AC's capacity (in tons) to the room size is crucial for efficiency.

2. AC capacity (Tonnage)

  • The tonnage of an AC refers to its cooling capacity. Higher tonnage ACs consume more power. An undersized AC will run continuously to cool the space, using more energy, while an oversized AC will frequently turn on and off, also wasting energy.

3. Temperature settings

  • The lower the thermostat setting, the more power the AC uses. Setting the AC to moderate temperatures (around 24°C to 26°C) can reduce energy consumption significantly.

4. Insulation and sealing

  • Proper insulation and sealing in walls, windows, and doors help in maintaining the temperature inside the room, reducing the need for continuous cooling and thus saving power.

5. Usage patterns

  • The more hours the AC runs, the more energy it consumes. Using the AC only when necessary and utilizing energy-saving modes can reduce consumption.

6. Energy efficiency rating (EER/ISEER)

  • ACs with higher star ratings (5-star) or better energy efficiency ratios (EER or ISEER) consume less power for the same level of cooling. Investing in energy-efficient ACs results in lower electricity bills.

7. Outside temperature

  • Higher outdoor temperatures require the AC to work harder to cool the indoor space, leading to increased power usage. In contrast, on cooler days, the AC doesn’t need to run as much.

8. Condition of the AC unit

  • Regular maintenance like cleaning filters, ensuring proper refrigerant levels, and checking for any leaks help the AC perform efficiently. Dirty or malfunctioning units consume more power.

9. Type of AC (Inverter vs non-inverter)

  • Inverter ACs adjust their compressor speed based on the cooling requirement, consuming less power over time. Non-inverter ACs, on the other hand, constantly switch the compressor on and off, leading to higher energy usage.

10. Location and placement of AC

  • Installing the AC in a shaded area prevents it from absorbing excess heat. Direct sunlight on the outdoor unit can make it work harder, consuming more energy.

11. Humidity levels

  • High humidity makes the air feel warmer, so the AC must work harder to maintain comfort. Dehumidification is a key feature in some ACs to handle this factor efficiently.

12. Appliances and lighting in the room

  • Electronic devices and lights generate heat, increasing the cooling load on the AC. Turning off unnecessary appliances can help reduce power consumption.

1.5-ton AC electricity use: Per Hour, per Day and per month

BrandSuggested modelConsumption (Units/Hour)
LGLG AI Convertible 6-in-1, 1.5 Ton 5 Star split AC1.2
DaikinDaikin 1.5 Ton 4 Star Inverter Split AC (MTKL50U)1.6
CarrierCarrier 1.5 Ton 5 Star flexicool convertible 6-in-1 inverter split AC1.3
HitachiHitachi 1.5 Ton 5 Star inverter split AC1.8
VoltasVoltas 1.5 Ton 5 Star adjustable inverter split AC1.45
PanasonicPanasonic 1.5 Ton 5 star twin cool inverter split AC1.25


 

Looking for a power efficient and reliable air conditioner? Check out the Best 1.5 ton AC options available for the best features and deals.

Updated price list of the 1.5 ton ACs in India (April 2026)

ModelPrice
Carrier 1.5 Ton 5 Star Xcel Edge Inverter ACRs. 39,490
Voltas 1.5 Ton Inverter Split ACRs. 32,000–Rs. 38,000
LG 1.5 Ton AI Dual Inverter Split ACRs. 42,000–Rs. 45,000
Samsung 1.5 Ton Wind-Free Inverter ACRs. 44,000– Rs. 47,000
Haier 1.5 Ton Inverter Split ACRs. 34,000–Rs. 36,000
Whirlpool 1.5 Ton Magicool Inverter ACRs. 30,000–Rs. 35,000


Disclaimer: The features, availability, and pricing of each model are subject to change and may vary. For the most accurate and up to date information, please visit the official website.

Before you decide, explore the latest offers. You may find a great deal on an AC model that matches your needs.

How to calculate the 1.5-ton AC current consumption using the EER formula

The EER formula actually can't be directly used to calculate the current consumption of your AC, including a 1.5-ton window AC. The EER relates the cooling capacity of the AC to the power it consumes, but it doesn't tell you anything specific about the actual current draw.

Here's how EER is used to estimate power consumption:

EER (Energy Efficiency Ratio) = Cooling Capacity (in BTU/hr) / Power Consumption (in Watts)

However, to calculate the current, you'd need to know the AC's voltage rating as well. With both EER and voltage, you can use the following steps:

  1. Convert BTU/hr to Watts: Multiply the cooling capacity (in BTU/hr) by a conversion factor of 0.9478 to get Watts.
  2. Calculate Power Consumption: Divide the cooling capacity (in Watts) by the EER rating of your AC.
  3. Find the Current: Divide the Power Consumption (Watts) by the voltage (in Volts) to get the current (in Amperes).

Important Note:

  • The EER rating and voltage information can be found on the AC unit's label or user manual.
  • This is an estimate, and the actual current draw can vary depending on the operating conditions of the AC.

For a more practical approach, you can estimate the AC's power consumption directly using its EER and tonnage (cooling capacity). Multiply the tonnage by a base value, like 1.5 kW, to get an approximate value in kW. This will give you a general idea of how much power the AC uses.

You can also check out - Window vs split AC electricity consumption

You can also explore the latest offers on a wide range of electronics and home appliances, making sure you get the best deal on every purchase.

How Star Ratings affect 1.5-Ton AC power consumption

Star ratings play a key role in determining how much electricity a 1.5-ton AC consumes. Higher ratings mean better efficiency, lower bills, and smarter cooling for long-term savings.

  • 1-Star ACs: Consume the most electricity, offering basic cooling but leading to higher monthly power bills.
  • 3-Star ACs: Provide balanced cooling with moderate efficiency, suitable for households using ACs occasionally.
  • 4-Star ACs: Deliver better energy savings than 3-star units, reducing electricity costs while maintaining strong cooling performance.
  • 5-Star ACs: The most efficient option, saving up to 25–30 percent more power annually compared to lower-rated models, ideal for frequent use.
  • Inverter ACs: Often paired with higher star ratings, they adjust cooling based on room load, ensuring consistent comfort with reduced energy consumption.

Inverter vs non-inverter AC 1.5-ton AC: Impact on electricity usage

Choosing between inverter and non-inverter 1.5-ton ACs directly impacts electricity usage and long-term savings. The table below highlights how each type performs in terms of efficiency and power consumption.

FeatureInverter 1.5-Ton ACNon-Inverter 1.5-Ton AC
Electricity usageAdjusts compressor speed based on cooling demand, consuming less power overall.Runs at a fixed speed, consuming more electricity during continuous use.
Energy efficiencyHighly efficient, saves up to 30–40 percent compared to non-inverter models.Less efficient, leading to higher monthly electricity bills.
Cooling performanceProvides consistent cooling with fewer temperature fluctuations.Cooling may vary, with frequent on-off cycles causing uneven temperatures.
Noise levelsOperates quietly due to variable compressor speed.Louder operation because of frequent compressor start-stop cycles.
Long-term savingsHigher upfront cost but significant savings on electricity bills over time.Lower initial price but higher running costs in the long run.

 

Best thermostat and usage settings to lower 1.5-ton AC bills

Using the right thermostat temperature and AC settings can significantly reduce electricity consumption while maintaining comfortable cooling. Proper usage habits also help improve the efficiency and lifespan of a 1.5-ton air conditioner.

• Set the temperature between 24°C and 26°C: This range provides balanced cooling while consuming less electricity compared to very low temperature settings such as 18°C or 20°C.

• Use eco mode for daily cooling: Eco mode automatically adjusts cooling performance and compressor usage to improve energy efficiency and reduce power consumption.

• Enable sleep mode at night: Sleep mode gradually adjusts the temperature during sleeping hours, helping lower electricity usage without affecting comfort.

• Keep fan speed on auto mode: Auto fan mode allows the AC to optimise airflow according to room temperature, improving cooling efficiency and reducing unnecessary power usage.

• Avoid frequent temperature changes: Constantly lowering or increasing the thermostat forces the compressor to work harder, which can increase electricity bills.

• Use timer settings effectively: Setting automatic shut-off timers prevents the AC from running unnecessarily when the room is already cool or unoccupied.

• Keep doors and windows closed during operation: Preventing hot air from entering the room helps maintain cooling efficiency and reduces compressor load.

• Use curtains or blinds to block sunlight: Reducing direct heat inside the room helps the AC cool faster and consume less electricity.

• Clean AC filters regularly: Dirty filters restrict airflow and force the AC to use more power for effective cooling.

• Use stabilisers and proper voltage protection: Stable power supply helps maintain efficient AC performance and prevents unnecessary energy loss.

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How much electricity is consumed by an 1.5 ton AC?
The electricity consumption of a 1.5 ton AC varies based on factors such as its star rating, usage patterns, room insulation, external temperature, and maintenance. On average, a 5 Star 1.5 ton AC consumes around 1.2 to 1.5 units per hour, while a 3 Star AC uses approximately 1.5 to 1.7 units per hour.
How much current is required for an 1.5 ton AC?
The current required for a 1.5 ton AC depends on its power consumption and the operating voltage. For example, a 1.5 ton AC with a power input of 1,800 watts and operating at a standard voltage of 230V would require approximately 7.83 amperes of current.
Does a 1.5 ton AC use more power than a 1 ton AC?

Yes, a 1.5 ton AC generally uses more power than a 1 ton AC as it has a higher cooling capacity, meaning it needs more energy to cool larger spaces. However, factors like efficiency, usage patterns, and technology can influence the overall power consumption.

How much power does a 1.5 ton AC use when cooling a room?

A 1.5 ton AC typically uses around 1.5 kW per hour, depending on its energy efficiency rating and operational conditions. Inverter technology can reduce power usage by adjusting the cooling based on room temperature, potentially lowering energy consumption over time.

How can I reduce the power consumption of my 1.5 ton AC?

To reduce power consumption, set the AC to an optimal temperature, usually around 24°C. Regular maintenance, cleaning filters, ensuring proper insulation, and using energy-saving modes can also help reduce electricity usage. Inverter ACs are more efficient, adjusting output based on cooling demand.

Does the temperature setting impact the power usage of a 1.5 ton AC?

Yes, temperature settings significantly impact power usage. Lowering the AC temperature forces the unit to work harder, consuming more electricity. Setting the thermostat around 24°C provides a balance between comfort and energy efficiency, reducing the overall electricity consumption.

What is the power consumption of a dual inverter 1.5 ton AC?

A dual inverter 1.5 ton AC generally consumes less power than a standard AC. It can adjust its compressor speed based on cooling needs, typically using around 1.2 kW per hour. This results in energy savings of up to 30-50%, depending on usage and environmental factors.

Does the age of a 1.5 ton AC affect its power consumption?

Yes, the age of a 1.5 ton AC can affect its power consumption. Older units may become less efficient due to wear and tear, outdated technology, or lack of maintenance, leading to higher electricity usage. Upgrading to a newer model can improve efficiency and reduce power consumption.

Which 1.5-ton ACs have the lowest power consumption?

1.5-ton Inverter AC models with 5-star energy ratings generally offer the lowest power consumption. Inverter ACs with eco mode and variable-speed compressors consume less electricity compared to non-inverter models.

 

Can a 1.5-ton AC Run on a 5 Amp Circuit?

No, most 1.5-ton ACs require a dedicated 15 Amp power socket because of their higher power consumption and compressor load. Using a lower-capacity circuit may cause overheating or electrical issues.

 

Does a 1.5 ton inverter AC use less electricity than a non-inverter one?

Yes, a 1.5-ton inverter AC usually consumes less electricity because the inverter compressor adjusts its speed according to cooling demand instead of operating continuously at full capacity.

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