Thermal imaging allows inspectors who are qualified to use thermal imaging cameras to document certain conditions and include them an inspection report in a manner that is visually interesting. The photos are colorful and can be somewhat fascinating, especially to the many members of the public unfamiliar with thermography. Photos not only allow viewers to see temperature- and moisture-related problems from a different perspective, but often, subject temperatures are posted as part of the image. So there are both marketing and communication advantages to including thermal images in an inspection report.
Under the right conditions, typically having to do with temperature differentials, thermal imaging may allow inspectors to more easily identify temperature-related problems like inadequate levels of thermal insulation, and moisture problems like roof or plumbing leaks where they might not be obvious to casual observation, sometimes because no staining has yet occurred and/or because they are in a high ceiling or upper part of a tall wall.
As inspectors develop increasing levels of expertise, they may find a significant amount of additional work as thermographers, as opposed to home inspectors. In some areas of North America, as thermographers, they may also have considerably less competition.