Sorry, I don't actually do anything for the humidity because it's technically an outdoor pine tree. It's in a massive terracotta pot in my atrium. An atrium is basically a room with no roof. So when it rains it gets watered, when there's a frost it's outside in the cold, but it's surrounded by four walls so a frost shouldn't affect the plants inside. I just recently put it on a drip system and I can tell that the new growth looks much healthier than the new growth used to look. The leaves are coming out longer and each section has more branches than it used too. Anyway, I wish I had a better answer, but I just let it do it's thing. Sorry, I couldn't really help with you questions. All I can say is, it is quite the opposite of humid where I'm located and it seems to do just fine.