Yesterday was #sustainablehouseday. This event has been running for more than 17 years and provides a great opportunity for people to visit some of Australia's leading green homes. This home is just one of the incredible sustainable homes, which was open for inspection. The Steels Creek Underground House has used #earthwool R4.0 ceiling insulation, which has helped to maintain an average internal temperature of 22-23 degrees. Did you visit any of the open homes yesterday? What improvements would you like to make to your home to make it more sustainable?