At 1000 K, we predict ZT max of 0.560 for CTO, 0.535 for STO, and 0.214 for BTO, requiring n on the order of 10 21 cm -3 . At lower temperatures of 400 and 600 K, we predict that achieving the maximum ZT requires similarly large n, but the ZT max are much smaller, from 0.07-0.22 at 600 K 0.03-0.09 at 400 K. While the combination of a higher Seebeck coefficient but lower electrical conductivity results in an increase of ∼ 10 -40% in the power factors at higher temperatures, the increase in ZT with temperature is largely dominated by a ∼ 60% fall in the lattice thermal conductivity.