It’s easy to focus on which air conditioner sounds might indicate a problem, as we did in our last blog post. But air conditioners are always making noise when they are on. If you familiarize yourself with the noises that mean everything is a-okay, you can relax and let them be ordinary background noise. To know which sounds mean that your air conditioner is operating exactly as it should, it can help to know which parts of the AC unit are making the noise, and why.