High medical and energy costs, limited incomes, and narrow comfort ranges present multiple health-related challenges for older adults. A variety of studies indicate that weatherizing and repairing the homes of elderly households can help to address these issues, thereby improving resident health and reducing both energy and health costs. Weatherization and home repairs can therefore serve as preventative healthcare in some situations. Several recently launched pilot programs are building on these findings, but additional pilots and good evaluations of their impacts are needed. Ultimately, these programs hold promise for improving health and reducing medical costs.