The problem of heat transfer by vacancies in simple molecular crystals is considered. The experimental method of obtaining a possible vacancy contribution to thermal conductivity based on a comparative analysis of the behavior of isochoric and isobaric thermal conductivities is proposed. Such an analysis as well as theoretical estimations of the vacancy contribution to thermal conductivity of a number of simple molecular crystals makes it possible to conclude that a maximum value of the vacancy contribution to thermal conductivity does not exceed 3 - 4% of the lattice component even at premelting temperatures. It is suggested that the heat transfer by vacancies may be noticeable in some solid solutions.

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