I propbably only post 1 message a year on this topic: how I grow VFTs.
They grow in decent sized pots, approximately 6" in diameter. From February through July, the plants are brought indoors and grown in either my terrarium or grow rack. Humidity doesn't matter that I noticed, but strong light is required. They grow very fast, after a good winter's sleep. No aclimation is required from the cold to a warm house.
In August or there abouts, I bring the pots outside. Temps in western Washington range average 80 for a high and 55 for a low. Again, no aclimation is required. I use the tray method. They catch late summer bugs and get used to cooler nights as fall approaches.
I bury the pots up to the rim in a garden patch in October to insulate them better. They stay moist in our climate, and have survived temps down to 10 F or there abouts. The larger 6" pots insulate them better and hold moisture during dry spells. I have yet to lose a single plant with this method.
Here's a photo taken the other day, a few weeks after it was brought indoors.