As summer approaches, many households consider buying an air conditioner. Before purchasing a 1.5-ton AC, it is important to understand how much electricity it consumes and how it affects your monthly power bill. Electricity usage mainly depends on the star rating and efficiency of the AC.
Below is a simple calculation based on example models from Panasonic to explain the expected consumption.
Power Consumption of 1.5-Ton 5-Star AC
A 1.5-ton 5-star AC typically consumes around 681.01 units of electricity in 1600 hours according to its energy rating chart.
Calculation
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Electricity per hour: 681.01 ÷ 1600 ≈ 0.42 units
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Electricity for 8 hours:
0.42 × 8 = 3.36 units
Daily Cost
If electricity costs ₹7 per unit:
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3.36 units × ₹7 = ₹23.52 per day
Monthly Cost (30 days)
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₹23.52 × 30 = ₹705.60
So, running a 1.5-ton 5-star AC for 8 hours daily may cost roughly ₹700 per month.
Power Consumption of 1.5-Ton 3-Star AC
A 1.5-ton 3-star AC generally consumes about 877.74 units in 1600 hours.
Calculation
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Electricity per hour: 877.74 ÷ 1600 ≈ 0.54 units
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Electricity for 8 hours:
0.54 × 8 = 4.32 units
Daily Cost
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4.32 units × ₹7 = ₹30.24 per day
Monthly Cost (30 days)
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₹30.24 × 30 = ₹907.20
So, using a 1.5-ton 3-star AC for 8 hours daily may cost around ₹900 per month.
Key Difference Between 3-Star and 5-Star AC
| Feature | 5-Star AC | 3-Star AC |
|---|---|---|
| Units per hour | ~0.42 | ~0.54 |
| Units in 8 hours | 3.36 | 4.32 |
| Monthly cost (₹7/unit) | ~₹705 | ~₹907 |
A 5-star AC saves about ₹200 per month compared to a 3-star AC when used for 8 hours daily.
