I always look at the option of taking the registers off the vents to reduce the HVAC noise before deciding to turn the system off. That and a little room tone may do the trick. In regards to sticking mic mounts to skin, I typically use Topstick with good results. If you can stick it to the skin before they start to sweat, you have better results than if you don't get it on until they are already sweating. Sent from my SM-G900V using Tapatalk