An apparatus is provided that includes a device and a mechanism for heat transfer. The mechanism includes a hydrofluoroether heat-transfer fluid wherein the heat transfer fluid is represented by the following structure: Y—Rf—CH2OCH2Rf—Y wherein Rf may be the same or different and is, independently, selected from the group consisting of perfluorinated alkylene groups which may be linear, cyclic, or branched having from 1 to 10 carbon atoms, partially fluorinated alkylene groups having from 1 to 10 carbon atoms, and derivatives thereof wherein one or more carbon atoms are replaced by catenated nitrogen or oxygen heteroatoms, wherein each Rf contains at most one hydrogen atom, wherein Y represents H, F, or an RfCH2OCH2— group, and wherein the total number of carbon atoms in the molecule is at least 6. A method of transferring heat including the device and the provided heat-transfer fluid is also provided