I've decided that to make my waterchiller i'm going to use 2 drawered filing cabinet as the case, the bottom drawer will hold the coolant and the dehumidifier, i plan on using fiberglass to seal off the coolant from the dehumidifier and to seal off the entire compartment so it wont leak...will fiberglass and antifreeze react at all? also, does fiberglass make an ok insulator or should i insulate the compartment some more before making the fiberglass container? any ideas on how i can make the highest part of my loop not be right at the block? and will fiberglass hold up to -20C temps?