When you select a Heat Pump option for a heating or cooling system, a button labeled H.P. appears to the right. Click that button to open an advanced interface that drives a detailed hourly heat pump analysis. This analysis generates effective seasonal heating and cooling efficiencies that can be pushed back to the main interface. Press F1 while you mouse is over that popup to open Help.
The geothermal analysis currently relies on a constant, user-set ground loop entry water temperature. Depending on the system design, it is likely that this temperature varies seasonally. If you think that there is significant temperature difference between the heating and cooling seasons, then you may want to change the input between calculations. We are currently investigating how to improve this interface and analysis and welcome any input you may have.