Do nonmetals conduct heat?

Thermal conductivity of copper, a metal: 385 W/m-K Thermal conductivity of diamond, a non-metal: 2200 W/m-K So not only can a non-metal conduct heat, some can even do so better than most metals. read more

Conduction of heat depends on the bonding between the atom and how fast can they pass the heat via vibrations. For this it is not necessary that the conductor should be a metal. Polymers, ceramics and composites also conduct heat. read more

most of the non metals do not conduct electricity but there are some exceptions like graphite, Silicon-semi-conductor and metalloids(also semiconductors). electrical conductivity in metals is due to the presence of free electrons which are absent in non metals.By free(free to move) electrons we mean the electrons that are loosely bound to the nuclei. read more