I vape indoors in a spare bedroom and lately the windowsill and desk have been picking up a sticky film faster than I expected. I rent, so I can’t start cutting holes for an exhaust fan, and cracking a window in South Carolina summer just pulls in humid air that makes the room feel worse. I’ve been looking at a small HEPA unit for the room, but I’m not sure it would do much for vapor versus just dust. The filter replacement cost is also a concern since I’d likely be running it most evenings. For those of you who vape in a closed room, did adding a purifier actually cut down on residue or smell, or did you have to pair it with something else like a fan or carbon filter? Curious what has worked for people in similar setups.