“Hard-to-decarbonize” (HtD) houses are responsible for over a quarter of all direct housing emissions—a major obstacle to achieving net zero—but are rarely identified or targeted for improvement.”Hard-to-decarbonize” (HtD) houses are responsible for over a quarter of all direct housing emissions—a major obstacle to achieving net zero—but are rarely identified or targeted for improvement.Energy & Green Tech[#item_full_content]