If enough mass is used it can create a seasonal advantage. That is, it can heat in the winter and cool in the summer. This is sometimes called passive annual heat storage or PAHS. The PAHS system has been successfully used at 7000 ft. in Colorado and in a number of homes in Montana. [ citation needed ] The Earthships of New Mexico utilize passive heating and cooling as well as using recycled tires for foundation wall yielding a maximum PAHS/STES. It has also been used successfully in the UK at Hockerton Housing Project .
While the process had been demonstrated to work, considerable effort was still required before a prototype could be tested in the field. Lawrence assembled a team of physicists to tackle the problems, including David Bohm ,  Edward Condon , Donald Cooksey ,  A. Theodore Forrester,  Irving Langmuir , Kenneth Ross MacKenzie , Frank Oppenheimer , J. Robert Oppenheimer , William E. Parkins, Bernard Peters and Joseph Slepian .  In November 1943 they were joined by a British Mission headed by Oliphant that included fellow Australian physicists Harrie Massey and Eric Burhop , and British physicists such as Joan Curran and Thomas Allibone .