Boston officials had hoped to have aerial and street-level photos taken across about four square miles of the city this winter using infrared cameras that would show heat loss in the city homes.

Officials planned on sharing the photos and analysis with homeowners, and were hoping the findings would increase enrollment in efficiency programs and also create business opportunities.

But, the project hit a snag when the American Civil Liberties Union of Massachusetts raised concerns that the infrared cameras would reveal information about what’s going on inside the homes. Sagewell’s cameras can take up to 20,000 images of homes per day.

Despite the concern, towns outside of Boston have not had any problems with the program. Utilities and environmental groups from Springfield and Hamilton are in the process of initiating the same project in their communities.