Another from Mr. Herbert’s Science class, using a practical, personal application as a lesson, we study the operation and repair of the Geo Thermal heat pump. Theory: Use coils under ground in your yard to cool and heat the freon in the Heat Exchanger, instead of the coils and fan that is usually parked outside your home in a big unit with a loud fan that is used to cool those coils with the hot air surrounding it. That is the old fashioned way and that is quite in-efficient, compared to …