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Pick the Right AC – 1 Ton – 2 Ton & 3 star or 5 star ratings in India

As the Indian summer heats up, staying cool becomes a priority. But choosing the right air conditioner (AC) can feel overwhelming.

This guide will be your one-stop shop to Pick the Right AC for your needs. We’ll explore factors like room size (from 1 ton to 2 ton), energy efficiency (3-star vs. 5-star ratings), and even how electricity costs can be affected by your choice.

We’ll also show you how to use fans the right way and give you other easy tricks to stay cool and save money on your electricity bill. Forget the summer heat, follow our guide and Pick the Right AC for a cool and affordable summer!

Selecting the perfect air conditioner (AC) isn’t just about staying cool. It’s about optimizing comfort, managing electricity costs, and accommodating the specific needs of your living space in India. Here, we’ll break down how to choose the best AC based on room size, electricity cost, fan usage, and how frequently the doors to the room are opened.

1. AC Capacity vs. Room Size

Understanding the relationship between AC capacity and room size is crucial:

Pick an AC

  • 1 Ton AC is ideal for rooms up to 140 square feet (about 10 ft. x 14 ft.).
  • 1.5 Ton AC works best for rooms between 140 and 190 square feet (around 12 ft. x 16 ft.).
  • 1.8 Ton AC, though less common, suits rooms between 190 and 250 square feet (approximately 14 ft. x 18 ft.) particularly if the room experiences high heat gain, such as direct sunlight or high occupancy.
  • 2 Ton AC is recommended for larger spaces between 250 and 400 square feet (16 ft. x 25 ft.).

2. Electricity Cost and Fan Usage

Using an AC in combination with ceiling or standing fans can enhance cooling and energy efficiency. Fans help distribute air evenly, allowing you to possibly opt for a slightly smaller AC unit or use the AC less intensively, thereby saving energy.

Moreover, 5-star rated ACs, while more expensive upfront, consume less electricity which can lead to significant savings over time. We highly recommend BLDC motors for cost efficiency and performance.

3. Impact of Door Opening Frequency

Frequently opened doors can let in warm air and make the AC work harder. If your room has high traffic, like a store that is open to public, consider increasing your AC’s capacity by 0.5 tons to compensate for the loss of cool air.

4. Additional Factors to Consider

  • Ceiling Height: Rooms with higher ceilings might require ACs with greater capacity.
  • Heat Gain: West-facing rooms or those with large windows can get very warm and might need a more powerful AC.
  • Inverter Technology: Though more costly initially, inverter ACs adjust their output based on need, reducing overall power consumption.

Optimizing Electricity Costs:

  • Comfortable Temperature Setting: Each degree above 22°C can save up to 6% on your power bill. Aim for around 24-25°C.
  • Timers and Smart Controls: Use these to run the AC only when needed and not continuously.
  • Regular Maintenance: Keeping your AC well-maintained, especially cleaning the filters regularly, ensures it runs efficiently.

Understanding Electricity Costs with CESC in Kolkata

For residents of Kolkata, the current tariff for domestic electricity usage ranges from Rs. 2.00 to Rs. 5.25 per unit, varying with the amount of power consumed. Details on specific slabs can be checked directly on the CESC website.

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Estimating AC Electricity Consumption

While precise calculations are challenging due to numerous influencing factors like AC capacity, room size, and daily runtime, here are general estimates:

  • 1-ton AC: Approximately 1-2 units per hour.
  • 1.5-ton AC: About 1.5-2.5 units per hour.
  • 2-ton AC: Roughly 2-3 units per hour.

Pick the Right AC – 3 Star vs 5 Star AC’s

The chart depicts the relationship between AC size (in tons) and estimated electricity consumption (in units per hour) for both 3-star and 5-star AC units. The x-axis represents the AC size, while the y-axis represents the electricity consumption.

Pick the Right AC - 3 Star vs 5 Star AC's

The chart shows that larger AC units (higher tons) consume more electricity, leading to higher electricity bills.

Additional Tips for Efficient Usage

  • Use CESC’s online consumption calculator to estimate your monthly expenses based on your AC’s size and usage.
  • Consult an AC professional: Especially for those installing an AC for the first time, or when moving into a new home with different dynamics.


Choosing the right AC involves more than picking the cheapest or the most powerful model; it’s about finding a balance between size, efficiency, and cost.

By considering your room’s specific needs, you can select an AC that not only cools effectively but also optimizes energy consumption, helping you save on electricity bills in the long run.

Regular maintenance, especially cleaning or replacing AC filters, is crucial to ensure your unit remains energy efficient over the years.

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