This is an integrated, hands-on session for grades 3-5, with the focus on the Science and Math in SteM! Participants will design a passive solar house given constraints and review test results to determine if the prototype meets specified criteria. Participants will apply real-life math skills, including whole number multiplication, area determination and fractions calculations, that are needed to solve the design challenge. In addition, the science concepts of properties of matter, heat/thermal energy transfer and conductors/insulators of heat will be explored. Through this collaborative and engaging lesson participants will develop critical problem-solving skills while learning the engineering process by focusing on real-world connections.