


Hissing or WhistlingĪ hissing sound that lasts for just a few seconds before stopping may not be a problem at all. That being said, take a look at the following air conditioning noises that you definitely should take seriously. Even if you know what a noise might mean, different problems can often cause the same type of noise, so it may take an air conditioning expert to figure out exactly what the problem is. The question is whether it’s a minor problem, a major problem or just a sign that your air conditioner is getting older. No one expects their air conditioner to be completely quiet, but there are normal air conditioner noises and then there are the other kinds of noises that make you sit up and say, “What on earth was that?” An unexpected air conditioner noise is often a sign of a problem.
