<BODY contentEditable=true onload=parent.init()><P>Since I got no replies, it was must have been a dumb question. I assume Std90 systems and plant are for the baseline only and for the proposed you can use something else. A proposed packaged VAVS with furnace heating and DX cooling produced nearly the same kbtu/sqft/yr (0.1 difference) as the baseline of chilled water and hot water. </P></BODY>