I live in az (dry climate) and we keep our house at 73 deg pretty much year round. We use glass tanks and have no issue with temps or humidity. Here are some tips;

Use plexiglass to cover excess screen on the top, the only opening is for the ceramic heat emitter.

We place the ceramic bowl directly under the heat source and have a uth under the water dish.

We use a thick (about 2") of aspen bedding.

Hide is on the cooler side of the tank.

Humidity stays right at 50-60 without misting. Will stay about 70-80 misting 1 time a day.

Water in dish stays at 85

Hot side is about 90

Cold side 80.

Pay attention to your snake, if he/she spends 100% of his/her time in 1 spot (including nighttime) , adjust temps accordingly. Snakes regulate their temp by moving to the appropriate area to suit their needs at the moment.