humidity has never been a problem for me or my friends - I grow primarily sativas which tend to have less dense buds - IF I was growing out an indica, that had big, dense buds, I would be more concerned - the keyword is DENSE, thats what traps the moisture, and allows mold - humidity really only becomes a major issue towards the end of the grow, when buds are dense and compact - at least, thats been OUR experience - Reaper and I have NEVER used a de-humidifier, etc. - just keep a good oscillating fan on the plants throughout their grow, and an exhaust fan to pull out the hot air - (just like worrying because your cabinet goes over 75 degrees, it's 100+ degrees outside in the summer), yup, 75 degrees IS better, but don't forget: "it's a WEED !" :jointsmile: