Well, they make some noise, but not as much as you'd think. I'm pretty sure that is on the spec of the various units so you can compare. We got a TOSOT and it

Well, they make some noise, but not as much as you'd think. I'm pretty sure that is on the spec of the various units so you can compare. We got a TOSOT and it's right out my office window but I can barely hear it (the indoor fan portion makes more noise in the house).