2016 Sense Publishers. All rights reserved. This PBL is designed for on-level or above-level high school students. Rooted in a common topic discussed extensively by environmentalists today, students will be given the opportunity to apply their knowledge and skills across STEM-based subjects in an effort to help solve problems of energy conservation within private homes. Prior to introducing this assignment, students should have a firm grasp on spatial reasoning, basic trigonometric functions, surface area, and optimization. This PBL can be used as a major project to demonstrate the importance of problem solving, critical thinking, time management, cooperation, and time allocation.