The behaviour of the specific heat (c), thermal conductivity (k) and thermal diffusivity (D) in the Smectic-A, Nematic and Isotropic phases of aligned 8CB has been studied with the photopyroelectric technique (PPE). The critical behaviour of c, k and D has been also determined at the smectic-A/nematic phase transition for different alignments. As expected, the behaviour of the thermal transport parameters is substantially different for omeotropic and planar alignment. It has been shown however that the thermal diffusivity critical behaviour is characterised by the same critical exponent in the two cases so that it does not seem to be connected to the absolute values of D. The thermal conductivity remains substantially flat at the transition temperature.