Research has shown that straw-bale construction is a sustainable method for building, from the standpoint of both materials and energy needed for heating and cooling.
Below you will see two different straw-bale designs. One is a ceramic arts studio, the other a residence. These were built in 2004 for less than $100. psf. The residence features passive solar design and requires very little additional heat from the hot water radiant floor to warm the home.