Quote:
Originally Posted by AC_Hacker
A GSHP will monitor the evaporator HX to prevent it from freezing, so it should have a similar effect on the loopfield.
-AC_Hacker
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GSHP manufacturers usually require glycol in the ground loop to protect against freezing the evaporator HX (controller usually shuts down at -5 to -10C), it's quite normal for the water being returned to the ground loop to be sub zero.
Steve