A legit exception might occur with a strict energy-optimization objective, where the point would be transporting heat outside of an HVAC envelope as efficiently as possible. The cost of the additional thermal load is often ignored by hobbyists in their energy calculations but it can be significant. In the context of fixed-capacity solar, for example, it might be cheaper to pipe waste heat from a telco closet to a space that isn’t climate controlled, like a garage, than it would be to expand the solar installation for increased HVAC draw.
