The temperature dependencies of two fast vibrational energy transfer processes in methyl fluoride (CH3F) have been measured between 120K and 400 K by means of time-resolved millimetre/submillimetre-infrared double resonance spectroscopy. The first of these processes, a resonant vibrational swapping process between the ground vibrational state and thev3= 1 (v3) vibrational state, effectively transfers population between states of A and E symmetry. A rapid increase in cross section with decreasing temperature was observed for this process, a result in excellent quantitative agreement with semiclassical theory of near resonant vibrational collisions. The second process, which transfers population between thev3andv6= 1 (v6) vibrational states, was found experimentally to have a much weaker temperature dependence. From this result and from additional experimental observations of symmetry type-sensitive energy transfer intov6, the energy transfer betweenv3andv6was demonstrated to result from a ‘direct’ vibrational energy transfer rather than from an ‘indirect’ vibrational swap process.