I ordered an 8,000btu WhisperTech Unit for my bedroom after reading other's reviews. The unit I received was very quiet, but had an odd vibration noise that I didn't feel was consistent with the reviews. I reached out via Facebook messenger about my concern, and received an IMMEDIATE response. I was assured that this shouldn't be happening and a new unit was shipped immediately, along with a free return label for the defective one. The second unit had the same issue, but louder. Again, they immediately worked to make it right. The third unit works great and is remarkably quiet. It cools my room quickly, was super easy to install, and the app is also great. I'll likely be buying more for other rooms in my house.