Have radiant floor heat, currently heated from oil boiler. Also, a broken 2-ton AC system in attic. Will use a 3-ton water-to-water unit for both functions (with added water coil for AC) Water geothermal pumps require buffering tank to reduce cycling frequency. Am concerned about having ‘tons’ of water buffered when switching between heat and AC. Any thoughts, experiences, or recommendations? For a start, this might argue for poorly insulating the buffer tank, lol. Perhaps a temp sensor on tank to not allow switching modes until tank has cooled/warmed to ambient temp. This is a residential application so this shouldn't be hardship -- and have young grandkids that love to play with thermostats, etc.