A Quick Aircon Buying Guide From a Seasoned Aircon Contractor

A Quick Aircon Buying Guide From a Seasoned Aircon Contractor


In need of a new air conditioner (aircon)? Find out everything you need to know in this quick aircon buying guide. As a result, you can choose one that best suits your place.


But, you might be thinking: why do you need this guide? Can you just buy the most expensive aircon you can afford?


That is not always true; a heftier price tag is not perpetually the correct choice. There are other factors to consider.


Four things to know before you buy an aircon


Besides deciding on a budget, you should know about these things before exploring electronic stores to find your most desired aircon. Understanding them helps to get the best out of your money and save money in the long run.


The area size


You need to find out the area size for the space you are planning to cool with your new aircon. Knowing the exact area size helps in calculating the BTU needed. Therefore, it is best to identify the total square metres or feet of your room.


For instance, the typical HDB room size ranges from 10 to 15 square metres.


British Thermal Unit (BTU)

how to calculate aircon btu

Image source: Samsung


In simple words, British Thermal Unit or BTU in an aircon defines its cooling power. The higher the number, the greater the cooling capacity is.


That does not mean you can just buy an aircon with the highest BTU you can get with your money. You need an aircon that has the correct BTU for your room size.


What will you get if you do not choose the correct BTU for your new aircon?

  • An oversized BTU: costlier to operate, and it cannot dehumidify your space properly, leaving you with a room that is too cold and a clammy space.
  • An undersized BTU: struggle to cool a room, inadequate dehumidification, and inefficient


Through the following linked guide, you can easily calculate the correct aircon BTU for your room.


Energy Efficiency Rating (EER)

how to read energy label

Image source: NEA


In Singapore, Energy Efficiency Rating (EER) is rated with a tick by National Environment Agency (NEA).


The easiest way on how to read the energy label is to check its tick. The more ticks your desired aircon has, the more energy-efficient it is, and the less it will cost to run. Hence, saving you money in the long run.


It is important to note that more ticks will also bring a higher price tag.


Noise level


Most people buy an aircon to have a good night sleep at a comfortable temperature. But, you cannot have a well-rested night if your aircon makes a noise louder than the acceptable level. That is why you need to find out the noise level of your desired aircon.


Noise level is measured in decibels (dB). The higher the dB, the louder the sound is and vice versa. Therefore, choose an aircon with a low noise level.


For example, on average, an aircon usually emits 50-60 dB. As a comparison, a 60 dB sound level is the average sound level of a normal conversation or a running aircon.


Aircon buying guide to choose the best AC for your space


By this point, you should already know the important specifications you need for your new aircon. Now is the time to decide which type is the best for you.


Types of air conditioners


For residential premises, NEA recognises and rates three types of aircon best for residential in Singapore. They are:

Split or multi-split system air conditioner

split system aircon


It is the go-to choice for so many households in Singapore. In Singapore, a single split system costs about $1,000 to $1,500 on average. On the other hand, a multi-split system can cost up to $5,000.



  • Quieter than other systems because its compressor is sitting in the outdoor unit
  • Provide adequate cooling to typical HDB room
  • Easy maintenance



  • Pricier than casement or window aircon
  • You need professional installation


Casement air conditioner

casement aircon


A casement aircon is also known as a vertical aircon. Most casement aircon in today’s market has a price range of $800-$1,099.



  • A budget-friendly option for a room with limited space
  • Ideal for a room that cannot accommodate split system installation
  • Cheaper installation



  • The primary purpose of a window is gone
  • Noisy because the compressor sits within the unit you place on your window


Window air conditioner

window aircon


It is more or less the same with a casement aircon. However, a window aircon usually has a lower price than a casement aircon. That is possible because a casement aircon has more features than a window aircon.



  • A good option for a small space
  • Least expensive option if compared to a split or casement air conditioner



  • Noisy
  • It also makes you lose the purpose of your window
  • Inefficient to cool a huge space


Read more about types of aircon in today market.


Other important factors in choosing an aircon


After determining the type of your desired air conditioner, there are other factors to help you pick the best option for your place.

Check the air filter of your desired aircon

Cleaning the air filter is the easiest way to maintain the efficiency of an aircon. That is why you want an aircon with easily accessible filters—filters that do not require professional help to be cleaned occasionally.

Check the warranty

Before purchasing, find out the information regarding the warranty of your desired aircon. Regardless of how known the brand is, there is always a slight chance an electronic appliance can break. It is better safe than sorry.

Features to consider

Some excellent features to have in an aircon are

  • Programmable timer: allows you to turn on or off aircon at a desired time, such as like 30 minutes before the usual time you reach home after work or 30 minutes before the sound of your morning alarm
  • Multiple operating modes: besides a cooling mode, an aircon can also have other modes such as Dry or Dehumidifier mode, Heat, or Fan
  • Energy-saving features: extra energy-saving features can help you avoid excessive aircon use

The location of your window

Suppose you want to buy a window or casement aircon, then factor in the location of your window. If your window is not centred on the wall, consider a window or casement aircon that can blow air to its right or left.


After you buy your air conditioner

maintaining aircon is the best way to keep how aircon should work


Have you decided on your most desired aircon for your indoor space? Then, keep the following points in mind to keep them in top condition over the years.


Professional aircon installation


Pick a certified contractor to perform an aircon installation. Professional installation ensures your unit remain covered by the manufacturer’s warranty. Also, it ensures everything is done correctly and safely.


Remember, the guideline from HDB is an aircon must be installed by a certified professional.


Clean your air filter


You need to clean your air filter occasionally. Doing it is easy and does not require professional help.


But, what is the benefit of it?


It helps to maintain the efficiency of your aircon and avoid an unnecessary increase in electricity bills. A dirty air filter can increase energy consumption by 5% to 15%.


Regular aircon maintenance


Besides cleaning your filter occasionally, you also have to service it regularly. Professional aircon servicing gives your aircon cleaning while performing maintenance checks at the same time.


It is essential to prolong the lifespan of your aircon, perform efficiently, and avoid hefty repair costs because any issues can be detected and repaired early.


At Purer Fresher Air, we have a wealth of experience and a certified contractor to keep your aircon in tip-top condition. Need proof? Check our appointment page.


You can also call us at +65 9830 8224 if you need urgent technical assistance.

Get Purer Fresher Air With Us Today!