<div class="wpbdp-field-display wpbdp-field wpbdp-field-value field-display field-value wpbdp-field- wpbdp-field-meta wpbdp-field-type-url wpbdp-field-association-meta " ><div class="value"><a href="http://www.earthshelter.com/" rel="" target="_self" title="Performance Building Systems">Performance Building Systems</a></div></div>
Steel structural systems with concrete, forms a shell rated in excess of 4000-psi. When sheltered with earth, the home benefits from the constancy of the earth’s temperature, greatly reducing heating and cooling expense.