I don't keep boas, but figured I'd chime in with general tips to help with temps and humidity.
Covering the screen lid goes a long way to help with heat and humidity.
Adding a CHE will definitely help your ambient and cool side temps.
Keep in mind, the CHE will also drain humidity, so covering the screen lid will help that.
Aspen will dry out real quick too, so you might want to try a different substrate. I use a blend of eco earth and repti-bark. It's great for humidity, odor control, looks natural and is easy to spot clean.
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