CHE usage

[snakeophile]

I have learned from you guys that a CHE should be used under the following conditions:
1. controlled with a thermostat
2. should not exceed the wattage of the socket
3. should be outside the enclosure or, if inside enclosure it should be
protected by wire guard.



Pet shops and product manuals say:
1. never put a CHE in any dome.
2. never use a CHE in a high humidity

Question: How can I use a CHE for my tropical semi arboreal snake in a glass terrarium with a screen top.