Please provide further details regarding this measure. What are its limitations? Its main assumptions? This measure nicely strips existing HVAC equipment from a model and runs an "optimally-sized" ground loop and that it "reflects the HVACE recommendations of the 50% K-12 AEDG" guide. How is this ground loop size calculated to float between 5C and 21C as the measures specifies, and what/where are the soil properties and borefield configuration details that influence the performance of the ground exchanger?