  We theoretically study thermal transport in an electronic interferometer
comprising a parallel circuit of two quantum dots, each of which has a tunable
single electronic state which are connected to two leads at different
temperature.As a result of quantum interference, the heat current through one
of the dots is in the opposite direction to the temperature gradient. An excess
heat current flows through the other dot. Although locally, heat flows from
cold to hot, globally the second law of thermodynamics is not violated because
the entropy production associated with heat transfer through the whole device
is still positive. The temperature gradient also induces a circulating
electrical current, which makes the interferometer magnetically polarized.
