  We investigate the basic charge and heat transport properties of charge
neutral epigraphene at sub-kelvin temperatures, demonstrating nearly
logarithmic dependence of electrical conductivity over more than two decades in
temperature. Using graphene's sheet conductance as in-situ thermometer, we
present a measurement of electron-phonon heat transport at mK temperatures and
show that it obeys the $T^4$ dependence characteristic for clean
two-dimensional conductor. Based on our measurement we predict the
noise-equivalent power of $\sim 10^{-22}~{\rm W}/\sqrt{{\rm Hz}}$ of
epigraphene bolometer at the low end of achievable temperatures.
