When you want to buy something that makes noise, like a vacuum cleaner or an air conditioner, you should look for something that is "buy quiet." This means that the thing you buy has been designed to make less noise than other things that do the same job.
When things are noisy, they can hurt your ears and even make it hard for you to hear important things like people talking to you or music. That's why it's important to buy quiet things, so you can avoid making too much noise and hurting yourself and others.
When you're shopping for something that makes noise, look for the "buy quiet" label or ask the store worker if they have any quiet options. And remember, it's always better to be quiet and considerate of others.