This workshop explores cost effective opportunities to implement energy efficient and green technologies and strategies into remodeling projects. The fundamentals of building science – air, heat, and moisture flow – are applied to help participants understand how elements of a house all work together as a system. We review the most common remodeling and rehab projects and the opportunities for energy savings (roofs, windows, kitchen & bath, basement finish, re-siding) and compare the cost effectiveness of enclosure (shell) improvements vs. mechanical improvements while providing hints for implementing both. Participants gain a full understanding of the importance of combustion safety, indoor air quality, how tight is too tight, and effective ventilation strategies.