At 5 AU, I don't think the surface would be warm enough, since most of the atmospheric heat and warmth comes from the sun. I suspect that any radiant or reflected heat from Jupiter would be negligible. Assuming you could get the other Gallilean-sized moons into stable orbits, the tidal heating may not be insignificant, but the heat flow through the crust would be similar to Earth, meaning not very high, unless it's via vulcanism. If the atmosphere were thick enough, it might hold onto the heat and warm up, but that would have ramifications on the habitability of the moon. But I'd ask a planetologist or a moonologist to confirm and explain in more detail.
Originally Posted by PlutonianEmpire
Et tu BAUT? Quantum mutatus ab illo.