Passive solar homes are designed with better building orientation and form and use ventilation, daylighting, shading, and other techniques to improve the house's energy efficiency. Passive solar homes also use thermal mass and effective distribution mechanisms to retain more heat. Best Passive Solar Home Designs. Home design can do wonders for passive solar houses, and slight changes in the design can significantly impact how hot or cold your house stays in the winter. While we've covered most of the. Passive solar home design is a great way to save on winter heating costs and reduce the need for expensive heating systems. It's also an eco-friendly and energy-efficient way to build your home. Building design and orientation are essential for passive solar.