I would suggest getting a second UTH for the middle of the vive and having it set to about 80F or so. That is what I did with my PVC vive because it is shared (with a divider!) with my corn; they have a shared UTH set at 83.5F and the ball python has a hot spot UTH for 90F. No, it doesn't heat the air, but it was suggested to me by Ricky (from Rickey's Reptiles)
I think it works wonderfully.