As buildings become part of the climate change solution, more building professionals and their customers want to know how they can reduce carbon emissions in home retrofits. The presenters conducted a research study to answer this question by assessing the net carbon impact of insulation and air sealing upgrades when accounting for both embodied carbon emissions of materials and operational carbon reductions associated with weatherization upgrades. This research, built off a study the previous year focused specifically on the embodied carbon emissions of weatherization, helps answer critical questions about the climate impacts of weatherization practices. In this presentation, we will present the results of the study and explore implications for best practices in the weatherization field.