daihashi ~ Humidity hasn't been a problem for us. It pretty much stays at 42% inside the homebox even with the house A/C running. When it dips below 40 we just turn on the cold humidifier for a few hours (outside the tent but aimed at one of the intakes). We haven't had to use it all that much during flower.

We kept the humidty at about 50% for vegging and just refilled the humidifier once a day. Our antique furniture pieces loved the extra moisture, too.