The myth that “a house needs to breathe” is still considered fact by many. 100 years ago houses did not have thermal control via insulation. Back then, air movement in the building assisted with drying the structure out in the wet season using natural ventilation. This was 100 years ago and today our standards for comfort and health are much greater. We no longer burn wood or coal as a primary heat source. We also don’t want to give half our paycheck to the utility company to have conditioned air and hot water.