 But the first thing you got to do is find out where that humidity is coming from. All right, here's the next one that's really good for keeping that indoor air quality clean, and that is having a good air filter and or air scrubber. Now, you want to have something, and I'm not just talking that little one-inch filter that is in your HVAC unit. Now, here's the thing. If you've got like a mini split heat pump,