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Frequently Asked Questions:


Common Misconceptions:

Can air conditioning make you ill
Only an ill maintained air conditioning system can make you ill. A well maintained air conditioning system can only contribute to a healthier environment.

Because it controls humidity levels the growth of dust mites and moulds is reduced. Air conditioning maintains humidity levels of 40 - 60% which is positive for persons with allergies.

Air conditioning may have integrated ventilation. Mechanical ventilation is getting more and more important because of the way houses are built these days. The supply of fresh air will prevent the sick building syndrome.

All units are equipped with a filter. Depending on the type of system and the needs of the customer, the type of filter will vary. The effectiveness of a filter goes from catching dust and particles over fine dust and pollen, bacteria, viruses and odours and even microbes and smoke.
It is essential to replace the filters on a fixed period. When you replace the filters too late you risk that the oversaturated filters start distributing bacteria instead of catching them.

When the equipment is correctly selected there will be no draught. This is the job of specialists and should be calculated by an installer. A system with too low capacity will not be able to reach the desired temperature. A system with too high capacity will lead to draught and fluctuating temperatures.

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Air Conditioning Related Abbreviations:
BTU: British Thermal Unit
DB: Dry Bulb        
kW: Kilowatt
°C: Degrees Centigrade
W: Wattage
WB: Wet Bulb
m²: Area in Meters
dB: Noise level in Decibels

What is air conditioning?

Air conditioning is the ability to simultaneously and effectively control the temperature, humidity, air movement and the quality of the air in a given space.

How does an air conditioner work?

Heat naturally flows from a warm to a cold substance, so air can therefore be moved from over a warm is a cold surface desired effect. This warm or cold surface can be obtained only through a process called ‘The Refrigeration Cycle’. This refrigeration process provides cooling below ambient temperature by transferring heat from one area (where it is not wanted) to another area (where it is not objectionable).

What types of air conditioners are available?
What does an air-conditioner consist of?

A typical air conditioning unit has four main components for the cooling cycle:

What are heat loads?

Remember, all the air in a given space needs to pass through the refrigeration cycle (air conditioner) for there to be ‘effective control’ of that area. Therefore, air conditioning can only be effective if the area to be cooled or heated is a sealed environment. For additional heat loads to BTU, the following calculation/s could be used:

How do you calculate the heat load?

Here follows a guide only. For a precise heat load calculation, a Heat Load Calculation Sheet should be completed. For offices, homes and your average area requiring air conditioning always keeps the following factors in mind:

What type of air-conditioner is suitable for me?
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Window / Wall unit – Self-Contained
A basic entry level air conditioner. This all-in-one unit is ideal for ‘smaller’ spaces such as offices or homes with an area not exceeding 48m². Simple and cost effective to install.

Split Type Unit – Mid wall
This air-conditioner is purpose designed for most offices or homes with an area not exceeding 60m² and has more features than the Window / Wall unit. (Quieter but more costly)

Split Type Unit – Ducted
This air-conditioner has one indoor unit mounted in the ceiling, cooling one or more areas via ducts to a grille exposed on the ceiling or wall. A cost effective method for many areas.

Split Type Unit – Cassette
This air-conditioner has one indoor unit mounted in the ceiling with an exposed grille on the ceiling. An ideal solution for shops or large open plan areas.


How should I maintain my conditioner?

Air conditioners are technically complex products that require regular maintenance. Failure to heed these requirements could result in reduction of product life span as well as breakdowns of expensive parts.

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Recommendations on maintenance include:

The owner is liable for any cost incurred for the installation and maintenance of the air conditioner, as the product warranty does not cover any of these costs.

What size aircon do you need?

For a precise assessment of the correct size of airconditioner required, a qualified aircon installer will need to do an on-site check as there are a number of different factors to consider. The following information will however give you an approximate guide to the aircon capacity required for a particular area.
Please use the table below to help calculate the size of your room by multiplying the length of your room by the width.

For a room of approximately: Aircon Size Required:
15 to 18 m²: 9 000 BTU
20 to 25 m²: 12 000 BTU   
30 to 35 m²: 18 000 BTU
40 to 45 m²: 24 000 BTU
55 to 60 m²: 30 000 BTU

The difference between an inverter and non inverter:

The difference between an inverter and non inverter is the inverter units can alter their speed in response to cooling demand. Some units have an initial over-speed period where they will run at a slightly higher capacity for a set time to pull down the temperature of a hot room. When they reach the set point temperature they can reduce capacity to maintain that level without cycling as much as a normal unit would. This saves power although it’s arbitrary as it would still take a while to recoup the increased purchase costs.

The inverter unit increases the power usage slightly as it converts the incoming power into a suitable style for the air conditioner although the ability to run at a reduced power level helps to drop the overall usage to below that of a typical non-inverter unit. Most of the advertising claiming 30% lower bills using inverters are based on very carefully set up laboratory scenarios. In reality, while they may cost less to run than a conventional unit, buying an efficient conventional unit will still be cost effective.

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