Thermal Operations seem to describe the most fundamental, and reasonable, set of operations allowable for state transformations at a background  temperature T. However they require experimentalists to manipulate very complex environments, and have control over their internal degrees of freedom.  In this work we ask whether in the context of Coarse Operations, which may be regarded as experimentally accessible Thermal Operations, ancillas are necessary to simulate all thermal operation transformations. By providing an explicit counterexample, we are able to show that indeed the experimentalist would need to have access to thermal ancillas to be able to deterministically extract the same work as with Thermal Operations. This is with the aim of establishing a minimal set of experimental operations, which would be of great help for experimental implementations.