Passivhaus has been the standard for cutting edge Energy Efficiency since the 1990s. Passivhaus has recently come out with the new EnerPHit Standard for Deep Energy retrofits of existing buildings because typical existing conditions can make the Passivhaus Standard practically impossible to achieve. With Passivhaus methodology and components the implemented retrofit should result in the maximum improvement reasonably achievable with respect to thermal comfort, structural protection, cost-effectiveness and energy efficiency. Please join Ken Levenson and Tomas O'Leary as they go into the details and implications of this new Passivhaus standard for Deep Energy Retrofits.