How do I heat a wooden enclosure?

[Mr. Misha]

Because I provide my snake with a hot spot of 90 degrees and I find that to be too hot for ambient temperature.

So that's kinda the question, why focus on doing the 90 degree hot spot if you can instead focus on providing a constant ambient temp? I think the hot spot is really towards more fish tank enclosures since glass tends to cool much faster. I've been running RHP only (with no hot spot) for the last seven years and haven't seen any negative effects at all. If anything, the BPs tend to be happy with the constant ambient temp. Regardless, to each their own but I do think that there's a much easier solution.