Take a journey into the realm of large scale building energy simulation. Fix simulates over 1 million single family residential buildings in Toronto''s climate using Python scripting the EnergyPlus virtual environment and Amazon EC2 computational resources. The goal of this thesis is to provide a more complete picture of how building design parameters can impact lifetime energy consumption. The best and worst 1% performers are analyzed with the conclusion that certain parameters dominate lifetime energy consumption in buildings. The dominant parameters include some surprises which can inform the building design profession.