This study provided practical advice for energy and water conservation message design by examining the role of choice provision (a message feature), message elaboration (a situational factor), and issue involvement (an individual factor) on intentions to conserve. The data were collected through an online survey experiment (N = 857). Across topics, message elaboration and involvement were positively associated with intentions. Furthermore, an interaction between message elaboration and involvement was found for both contexts. Choice did not directly affect intentions for either topic, although a 3-way interaction between choice, message elaboration, and involvement was found within the context of water conservation.