Condensers are heat rejection devices vital to industrial-scale systems including those found in the process and power industries. In a dropwise condensation system, the heat transferred to the condensing surface is related to the size distribution of attached drops. This study subjects a vertically-oriented condensing surface to mechanical vibrations ranging from 100 to 400 Hz, exciting the resonance modes of appropriately sized condensate drops. Resonating drops mobilize and shed from the surface at smaller size and with greater frequency than compared to a case without vibration, reducing the population of large, thermally inefficient drops on the surface. Excitation frequencies of 100 and 200 Hz yielded net improvement in estimated heat transfer rate in excess of 70% over the stationary case, suggesting that substantial reductions in fuel usage and footprint may be realized by applying this concept in condenser design. Published by Elsevier Ltd.