[Air Conditioner] What causes strange noises? How to identify the cause based on the type of sound

"There's a strange noise coming from the air conditioner."When using an air conditioner, you may suddenly hear sounds that ...
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How to choose the right portable air conditioner for your home – size, power and noise explained

When the next UK heatwave hits, a portable air conditioner can feel like an absolute lifesaver, especially if your home tends to trap heat upstairs, when you're trying to sleep or work. However, the ...