Cooling capacity of an airconditioner is measured in tonnes. The tonnage of an air conditioner depends on its BTU/hr (British Thermal Units per hour) value.

As a thumb rule, divide the square feet area of your room (length multiplied by width) by 600 to arrive at the basic tonnage capacity required. Add 0.5 tonnes for every 10 people occupying the room at the same time. Similarly, add 0.5 tonnes for every 1500 watts of appliances or lighting present in the room (A computer would consume about 300 watts and a regular bulb, 40 to 60 watts). Always round off on the higher side. This calculation is very subjective and each manufacturer has his own calculations for measuring required tonnage. Approx area of 130 sq.ft. would require 1 ton airconditioner. Very often manufacturers calculations suggest a number that is very high and your own discretion is required when you actually decide to buy.

Choosing the correct cooling capacity helps reduce your electricity bills. A larger airconditioner than what is required not only costs more but cools too quickly, switching on and off at very short intervals. This leaves the room unpleasantly cold and humid. On the other hand an air conditioner that is small for the room will take a longer period to cool the room and will not give very good results.

Energy Efficiency Ratio measures the cooling efficiency of the air conditioner compared to the power it consumes. It is the ratio of the cooling capacity in BTU/hr to its electricity consumption in watts. Machines with higher EERs help save on electricity consumption.

Models with a higher EER would be energy efficient and save on your electric bills but may be more expensive to buy.

Higher EER is better as it saves power.

Compressor type indicates the type of compressor that is fitted with your split airconditioners outdoor unit. Compressors are of three types: Reciprocating, Rotary or Scroll.

The compressor in the AC circulates the refrigerant (a cooling fluid charged by the AC manufacturer) through all the refrigeration system parts to provide uninterrupted cooling in the room.

Scroll compressors have the highest efficiency and are very reliable. This is as such a better option to go for.

It is the ability of the air conditioner to remove moisture as it cools the air. It is measured in litres per hour.

The moisture removal makes the room more comfortable and decreases humidity.

This is one of the reasons why air conditioners are so effective in humid areas and preferred over air-coolers which are used in the dryer regions of interior and western India.

A deodourising filter is a type of filter that cleans the air of any foul odour.

Filters clean the air as it flows through the airconditioner. A deodourising filter absorbs smells and odour generating particles like tobacco smoke, etc from the room.

Helps to keep the room odour-free thus keeping the air in it smelling fresh.

It is a type of filter that removes bacteria and fungus present in the air.

Filters clean the air as it flows through the airconditioner.

This is a boon for people with respiratory problems and those who live in humid areas.

It is a type of filter which removes dust particles form the air.

Filters clean the air as it flows through the airconditioner. An electrostatic filter generates an electrostatic field and attracts and removes dust particles thus cleaning the air.

With this filter, your family and you will enjoy breathing much healthier indoor air.

It is a type of filter which cleans the air from smoke, dust and germs.

Filters clean the air as it flows through the airconditioner. Ionising filter generate negative ions which combine with positive ions in the air to give clean air, free of smoke, dust and germs.

Helps to keep the room smoke-free thus keeping the air in it smelling fresh.