The expanded polystyrene (EPS) panels used in ICF provide an insulation R-value of 20. When this is combined with concrete thermal mass, temperature fluctuations inside the home are considerably minimized. This highly effective combination greatly reduces the amount of energy required for heating and cooling. When used in conjunction with with other high quality systems such as windows and roofing, homeowners have historically experienced an average of approximately 30-50% savings on heating and air conditioning costs annually. In addition, Drafts and hot and cold spots are virtually eliminated and a room's temperature remains consistent, providing exceptional comfort.