Abstract: Utilizing a nearest-neighbor research design, I find that households exposed to green neighbors within 0.1 miles are 1.6 times more likely to make their homes green within a year than the unexposed. The exposure also increases the likelihood of multi-property owners greening their faraway secondary properties, emphasizing that information from neighbors, not neighborhood characteristics alone, drive the effect. Financial benefits of green homes—house prices, electricity savings, and regulatory incentives—strengthen peer effects, whereas pro-environmental household preferences do not. An information-cost-based theory model explains the findings and suggests that aligning green subsidies with peer effects can accelerate residential green investments.