Poorly installed insulation and inadequate amounts of insulation can result in rooms that are too hot in the summer, too cold in the winter, temperatures that vary from room to room, and homes with unnecessarily high utility bills. High-performance insulation systems include generous amounts of  properly installed insulation that provide comfort throughout the home by retaining heat in the winter and keeping out unwanted heat in the summer. High-performance insulation systems include insulation in amounts that exceed the minimum amount required by code. For example high-efficiency insulation meets or exceeds the insulation levels required by the 2012 International Energy Conservation Code (IECC), which is ~15% more efficient than the 2009 IECC. Ultra-efficient insulation levels exceed the 2009 IECC levels by 50% or more.