In India, where temperatures can reach nearly 45 degrees Celsius in summer, air conditioners become an integral part of household comfort during these humid months. Summer is fast approaching, and with it comes scorching heat waves. I'd like to answer your questions about air conditioners, including:

Should you buy an AC?

What type of AC should you choose?

What size (tonnage) AC do you need?

Choosing the Right AC Size

The size of the AC you need depends on the area you want to cool. Here's a general guideline:

100 sq ft - 120 sq ft: A 1-ton AC is sufficient. However, several factors can influence your choice:

Sun exposure: If your home receives direct sunlight or you live on the top floor, consider a 1.5-ton or 2-ton AC for better cooling.

Occupancy: While a 1-ton AC might cool the area, it might struggle with 10-15 people as human bodies also emit heat.

Types of Air Conditioners:

There are two main types of ACs:

Window AC: This type requires breaking a wall for installation.

Split AC: This type consists of two units: an indoor unit and an outdoor condenser unit. The indoor unit can be mounted on a wall, while the condenser unit is placed outside.

Choosing between them depends on your preference and whether you're willing to modify your wall structure.

Copper vs. Aluminum Coils:

Air conditioners use coils to transfer heat. While both copper and aluminium coils are used, copper offers several advantages:

Superior heat transfer efficiency: Copper conducts heat better than aluminium, resulting in faster cooling.

Durability: Copper is more resistant to corrosion, offering a longer lifespan.

Although aluminium coils are lighter and cheaper, they are more prone to corrosion and less efficient.

Star Rating and Energy Efficiency:

Air conditioners are rated by stars, with higher ratings indicating better energy efficiency. Here's a quick guide:

5-star ACs: Most efficient, save money on electricity bills and are environmentally friendly.

3-star ACs: A good balance between cost and efficiency.

2-star or 1-star ACs: Less energy-efficient and will cost you more in the long run due to higher electricity consumption.

Understanding BEE's EER & ISEER Ratings (H2)

Choosing an energy-efficient AC saves money and helps the environment. In India, the Bureau of Energy Efficiency (BEE) uses EER (Energy Efficiency Ratio) for non-inverter ACs and ISEER (Indian Seasonal Energy Efficiency Ratio) for inverter ACs. Both ratings measure cooling capacity per unit of energy consumed. Higher ratings indicate better efficiency.


EER (Non-Inverter)

ISEER (Inverter)


5 Star

Above 3.5

Above 5.0

Most efficient, lowest energy consumption

3 Star

2.6 - 3.5

3.8 - 5.0

Good balance of cost and efficiency

1-2 Star

Below 2.6

Below 3.8

Less efficient, higher running costs


Inverter vs. Non-Inverter ACs:

Inverter ACs offer several advantages over non-inverter ACs:

Variable speed operation: Inverter ACs adjust their cooling speed to maintain a consistent temperature, leading to:

Energy efficiency: They use less energy than non-inverter ACs which constantly cycle on and off.

Comfortable cooling: Consistent temperature control prevents uncomfortable fluctuations.

Choosing the Right AC for You:

Advantages Of Inverter AC

Advantages Of Non-Inverter AC

More Energy-Efficient

Cheaper Than Inverter ACs

Low Noise

Cools Faster

Longer Life


With so many options, choosing the right AC can be overwhelming. Here are some highly-rated models that offer various features:

1. Voltas 1.5 Ton 5 Star Adjustable Inverter AC 185V Vectra Elite

This split AC features an inverter compressor with variable speed, adapting power based on heat load. It offers 4 cooling modes via remote control for tonnage adjustment (20% to 120% capacity). With a 1.5-ton capacity, it's ideal for medium-sized rooms up to 150 sq ft, with an impressive 5 Star Energy Rating and an annual energy consumption of 4900 units.

Special features include anti-dust and antimicrobial protection, anti-corrosive coating, LED display, self-diagnosis, sleep mode, turbo mode, and adjustable cooling. Using the eco-friendly R32 refrigerant contributes to ozone layer conservation and has a low impact on global warming.

Dimensions and weight include IDU (Indoor Unit): 96 cm x 31.7 cm x 23.5 cm, Outdoor Unit: 83.5 cm x 55.5 cm x 29.5 cm, IDU weight: 13.8 Kg, Outdoor weight: 30.3 Kg. The package includes 1 indoor unit, 1 outdoor unit, 1 interconnecting cable (3m), 1 set of interconnecting pipes (Copper) for indoor to outdoor connection, 1 owner's manual, 4 outdoor vibration pads, 1 remote with 2 AAA batteries, 1 indoor mounting plate, plastic sleeve, and screws for the mounting plate.

For Price and more details: Check out Rohit Ref 


This 1.5-ton Split AC with an inverter Swing compressor offers high ISEER (5.2) and Dew Clean technology for healthy air. Perfect for medium-sized rooms (111 to 150 sq.ft), it boasts a 5 Star rating for excellent efficiency. The warranty includes 1 year on the product, 5 years on PCB, and an impressive 10 years on the compressor.

Featuring a copper condenser coil for efficient cooling with low maintenance, it operates at 100% cooling capacity even at 43°C. The noise level is a minimal 38 dB(A), and it can handle ambient temperatures up to 54°C. Special features include a Triple Display for power consumption, set/room temperature, and auto error codes, along with Dew Clean technology for easy indoor unit coil cleaning.


Using the eco-friendly R32 refrigerant with no ozone depletion potential, this AC prioritizes environmental sustainability. The indoor unit dimensions are 229x885x298 ccms, weighing 9.5 kg, while the outdoor unit dimensions are 595x845x300 ccms, weighing 21.5 kg. The package includes the indoor unit, outdoor unit, remote control, user manual, warranty card, and a standard installation kit.

For Price and more details: Check out Rohit Ref

Frequently Asked Questions (FAQs)

  1. How do I clean my split AC filter?

Cleaning the filter involves gently removing it from the unit, washing it with mild soap and water, allowing it to dry completely, and then reinserting it back into the split AC. Regular cleaning of the filter ensures optimal airflow and cooling efficiency.

  1. What is the ideal room size for a split AC?

The ideal room size depends on the AC's capacity, typically ranging from small rooms of around 100 - 120 square feet for 1-ton units to larger rooms up to 250-300 square feet for 2-ton units. It's essential to match the AC's capacity with the room size for efficient cooling.

  1. How often should I service my split AC?

Regular servicing, ideally annually, is crucial to maintain optimal performance, prevent potential issues, and prolong the split AC's lifespan. Professional servicing involves cleaning the coils, checking refrigerant levels, and inspecting electrical components.

  1. Does a split AC require a stabiliser?

While many modern split AC units come with built-in voltage stabilisers, it's advisable to use an external stabiliser, especially in areas prone to voltage fluctuations, to protect the AC from damage and ensure consistent cooling.

  1. Can a split AC be used in rooms without proper ventilation?

Split ACs are designed for installation with both an indoor and outdoor unit connected by refrigerant pipes. They require proper ventilation for optimal performance. Using them in rooms without proper ventilation may compromise their effectiveness and pose safety hazards.