New owner, want to upgrade tank

New owner, have adult b. Boehmi. I would like to upgrade his (or her) enclosure because everything I've seen says the current one doesn't have enough space. Spider body length is 2.5ish inches. Current enclosure is 8 in × 8in ×10.

Planning on getting a 15 gal glass enclosure with a mesh top & adding substrate to the depth it currently is (dude has a very extensive burrow system at the moment). I was also considering adding an under glass heating pad to one side of the larger enclosure because my apartment is cheaply insulated & drafty, but some sources say that's a bad idea? Would it be OK if the tank was large enough that the spider had room to avoid it if it wanted?

Also, do terrestrial species benefit from cross ventilation? I've seen some people say it's only good for arboreal, and I would be concerned about legs getting stuck in holes in a acrylic tank which is why I was sold on a glass tank with a fine mesh screen.

Since I have only one tarantula space isn't an issue and I want to make a more visually interesting setup for me besides making a better home for them. Before I subject myself & it to the stressful experience of rehousing I just want to make sure that the new enclosure will actually be an upgrade for it, thanks!