How to choose a good Air Conditioner in 2026

How to choose a good Air Conditioner in 2026

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Now, everyone knows that a good air conditioner is one that has got the correct sizing. In other words, the unit should meet your needs and be sufficient for the square metres it is to cool. This is about a BTU/kW ratio.

Also, it is widely known that a good air conditioner is one that features high energy efficiency (A+ and better) and a long-term lifespan. So you do not need to spend tons of money on cooling or air con repair.
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But for those who live in the UK in general, and especially in London, it’s worth considering some other factors.

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Choose the right AC system

Your property type may determine the possible air conditioning type. Also, consider whether planning permission is required and whether you can get it.

Here are examples of recommended options for different premises:

• For standalone houses – multi-split or ducted systems
• For listed buildings or conservation areas – fully internal water-cooled systems
• For flats – fully internal systems (all-in-one monoblocs, water-cooled, or portable AC)

​To clarify, modern flats or premises in listed buildings or conservation areas may have leaseholder restrictions on external units and lack outdoor space. For installation of split systems in flats, you may first need to get planning permission from the building management company or leaseholder. Installation of systems with an external unit in a listed building may involve getting consent from your local planning authority. All this makes fully internal water-cooled AC systems a better option.

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Choose a quiet, dual-capability unit

For any premises, and especially for studios and other compact flats, it is wise to consider how many dB an AC unit produces. To clarify, compact flats are highly sensitive to noise, and loud air conditioner can make you feel very uneasy instead of comfortable. So, choose a unit with quiet operation – for example, within 27-34dB.

Another important factor to consider is cooling/heating capability of the unit. In the UK, and in London especially, specific climate conditions make both cooling and heating features demanded. In other words, a good air conditioner is one that can provide you with a year-round comfort, both when it is hot and cold outside.
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In conclusion, to choose a good air conditioner, consider its sizing, energy efficiency, lifespan, type, noise level, and dual heating/cooling capability.