Bethel residents have approved spending up to $450,000 to replace  the chiller plant and water treatment equipment at Bethel Middle School.  About a dozen residents attended Tuesday's special town meeting.  The money would come from the the Fund Balance.  The Middle School was designed with very few windows and meant to have air conditioning.  The equipment did outlasted it's expected lifespan, but school officials say when it was very hot outside recently, the system would fail.  They are hoping to replace it before this summer.