Efficiency Maine created a code of conduct for contractors to follow when working in homes. The code is available for download on the Efficiency Maine website, and dictates guidelines for respecting homeowners' property and communicating with the homeowner about appropriate information. Users on the Efficiency Maine website can search a list of vendors that have agreed to follow the code.

This presentation from Efficiency Maine shows early adopters and higher income residents tend to take advantage of large incentives, but smaller incentives may be a way to engage a broader range of income levels.