That's kind of sad to hear, I was hoping someone else had tried it and had some input for it, otherwise its kinda dissapointing sitting there in the room, needing a respirator while these bugs just go on like nothing's going on around them.
it works but the room must be sealed and the container of co2 at 82 F. a 50 lbs tank is ok for a 10x10 room hit at 20000 ppm for 2 hrs then air out then 20000 ppm for nother two.... done it...