I have many of the snakes in a snake room that is humidified to 60% I never mist there. There is a side turned tank and a PVCx enclosure in my bed room and my office. The bedroom is in the winter at about 28% RH and the office is 14% RH. I live in NS Canada north of the OP. I use eco earth and large water bowls I mist about once a week maybe. Humidity comes from the water bowl and substrate. NOT the snake! Reducing ventilation can lead to health issues. I use the take that water bowl away test for ventilation. If I remove the water bowl with mostly dry substrate I expect to see the enclosure's RH drop to the rooms RH or close in 2 hours or less. Mine this happens in under one hour.
I keep hearing over and over bulbs kill humidity. For the record glass does not absorb any appreciable amount of water nor does metal or most ceramic sockets. They only change air flow patterns it remains a matter of balance.
