The gently curved walls in this sun room made of cob serves to collect heat by way of the thermal mass properties of cob and the earthen floors (also called mud or poured adobe floors). The large windows and passive solar design of this straw bale hybrid house create large amounts of heat in colder months, which then can be vented into the other rooms via the windows which open into the main living space and bathroom. The sun room will serve throughout the year as a grow space for herbs in summer months and indoor drying space for laundry in the winter. During the summer months, due to the shifting angles of the sun, this room is cooler than it is in winter months. All in all this room was designed for a variety of functions and it performs well with them all.