One of the major technologies that has helped our community carve away operational energy is air to air heat pumps. We've seen these systems go from fringe to broad market adoption. But increasingly we're finding situations where they lack the abilities to meet changing goals. They also have major environmental implications as we see leaks of damaging refrigerants which is of growing concern as these systems age. We'll look at how hydronics may be a more stable, healthy, impactful, solution.