Earth Tube Performance The standing Temp is -10 deg. F outside at the Earth Tube Intakes. Earth Tube supply air temp inside the building is 46 deg. F. Like this:Like Loading... SIP Testing and Thermal Imaging is completed << >>Earth Tube Performance About the author : Net Zero Analysis & Design Corp. Principal and CEO of Net Zero Analysis & Design Corp Passive House Consultant Energy Star Partner RESNET Quality Assurance Provider Building America Partner US DOE Zero Energy Ready Home Partner Member of the Board of Directors for BSI Leave a Reply Cancel reply This site uses Akismet to reduce spam. Learn how your comment data is processed.