Neutron stars (NSs) are excellent candidates for detecting dark matter (DM) because of their extreme environments. One such mechanism is frictional heating caused by the creep motion of neutron superfluid vortex lines in the NS crust. In this work, we analyze current temperature data and show that vortex creep heating is likely the dominant effect. This highlights the challenges in using NS to set limits on DM properties, as careful consideration of the effects of internal heating is required.