We study how household demand for a technology that improves environmental health –- an electric induction cookstove – complements prior exposure to environmental health technology. More than a decade before, in a cookstove demand revealing auction, a random half of our sample had been exposed to an intensive behaviour change campaign to promote sanitation in rural India. We observe that demand for induction cookstoves among men seems to be affected by learning from the sanitation intervention, whereas demand by women is unchanged. These results suggest the importance of interactions between bargaining power, information and knowledge, and preferences.