  Effects of explicit temperature dependence in the exchange-correlation (XC)
free-energy functional upon calculated properties of matter in the warm dense
regime are investigated. The comparison is between the KSDT finite-temperature
local density approximation (TLDA) XC functional [Phys.\ Rev.\ Lett.\
\textbf{112}, 076403 (2014)] parametrized from restricted path integral Monte
Carlo data on the homogeneous electron gas (HEG) and the conventional Monte
Carlo parametrization ground-state LDA XC functional (Perdew-Zunger, "PZ")
evaluated with $T$-dependent densities. Both Kohn-Sham (KS) and orbital-free
density functional theory (OFDFT) are used, depending upon computational
resource demands. Compared to the PZ functional, the KSDT functional generally
lowers the direct-current (DC) electrical conductivity of low density Al,
yielding improved agreement with experiment. The greatest lowering is about
15\% for T= 15 kK. Correspondingly, the KS band structure of low-density fcc Al
from KSDT exhibits a clear increase in inter-band separation above the Fermi
level compared to the PZ bands. In some density-temperature regimes, the
Deuterium equations of state obtained from the two XC functionals exhibit
pressure differences as large as 4\% and a 6\% range of differences. However,
the Hydrogen principal Hugoniot is insensitive to explicit XC $T$-dependence
because of cancellation between the energy and pressure-volume work difference
terms in the Rankine-Hugoniot equation. Finally, the temperature at which the
HEG becomes unstable is $T\geq$ 7200 K for $T$-dependent XC, a result that the
ground-state XC underestimates by about 1000 K.
