Been reading regarding chiller efficiency. Not sure if these info have been shared here.
Might help you to decide whether should u get a chiller/upgrade chiller. Justify to your CO that it is worth it. Using the numbers to confuse her....
This link talks about whether higher HP leads to bigger savings and guide u to some $$ calculations.
http://www.arofanatics.com/forums/showthread.php?t=125010
This talks about some chiller stuff.
http://arofanatics.com/forums/showthread.php?t=166656