He/she shouldn't really be using a UTH for a tropical species as they require the air to be warm as well as the objects in the enclosure. UTH uses infra red energy to heat objects but the air remains cool. That's good for a temperate species but for a Boa you ideally need a ceramic heat emmiter or radiant heat panel. Then again it also depends on where you live. This is what I meant when I was talking about probe positioning for a CHE or radiant heat panel earlier.
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