This research demonstrates how promoting the environment can negatively affect adoption of energy efficiency in the United States because of the political polarization surrounding environmental issues. Study 1 demonstrated that more politically conservative individuals were less in favor of investment in energyefficient technology than were those who were more politically liberal. This finding was driven primarily by the lessened psychological value that more conservative individuals placed on reducing carbon emissions. Study 2 showed that this difference has consequences: In a real-choice context, more conservative individuals were less likely to purchase a more expensive energy-efficient light bulb when it was labeled with an environmental message than when it was unlabeled. These results highlight the importance of taking into account psychological value-based considerations in the individual adoption of energy-efficient technology in the United States and beyond.C limate change presents a major challenge to our current level of energy consumption. Much attention has been given to the development of energy-efficient technology as a way of addressing the problem of global warming and reducing the cost of energy use for consumers, but the demand for energy efficiency has not met expectations (1, 2). There are a number of potential roadblocks to the adoption of energy-efficient technology. People do not know the cost and energy savings associated with different technologies (3-5), and climate change is not viewed as an immediate threat requiring action now (6, 7). In addition, people tend to have short time horizons and discount the future hyperbolically, so that the upfront costs of switching to a new technology, even when it results in long-term net savings, can deter investment in more expensive energy-efficient products (8).Given these issues, one strategy for making energy-efficient technology attractive to consumers has been to focus on its environmental benefits (9). For example, a 2010 North American advertising campaign for the Toyota Prius (arguably the bestknown hybrid car) emphasized its environmental upside by telling viewers that "the world gets fewer smog-forming emissions" with a Prius, resulting in "harmony between man, nature, and machine." Similarly, the ENERGY STAR website (jointly run by the United States Department of Energy and the Environmental Protection Agency) promotes energy-efficient products as providing ways for people to "save energy and fight climate change." Because these messages explicitly emphasize environmental benefits, they likely resonate well with individuals who value protecting the environment. However, this emphasis on the environment might detract from the appeal of energy efficiency among individuals who do not want to be associated with environmental concern.This research investigated whether relying on environmental concern to promote energy-efficient technology may, in fact, present an additional roadblock to increasing demand by deterring otherwise interested co...