I will present some general results for all components of the thermal conductivity tensor in magnets, especially useful in regimes where the current is not carried by well-defined quasiparticles. This includes, but is not limited to, high temperatures as compared with the magnetic exchange scale, which is most easily accessible in magnets. I will also discuss general results for the effect of spin-phonon coupling on the thermal conductivity in magnets, obtained within a hydrodynamic approach.
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