AERCalc calculates the values used by the AERC (Attachments Energy Rating Council): https://aercnet.org/ EPc: Energy Performance for cooling, based on EnergyPlus simulations for a cooling climate (Houston, TX) EPh: Energy Performance for heating, based on EnergyPlus simulations for a heating climate (Minneapolis, MN) AERCalc has the following features: Import Windows with attachments from a WINDOW database Specify the air leakage values for specific products such as window panels Calculate the annual energy performance for heating and cooling based on EnergyPlus hourly simulations Export the results