A thermal imaging inspection can reveal areas of poor insulation, such as in this photo. As you can see, there is significant heat loss from the exterior walls above the garage, as well as around the upstairs windows. Notice that the attic is cool, indicating a well insulated attic space.
Older, less efficient windows can let out quite a bit of heat! Especially in Alaska, quality windows and doors are an important part of an efficient home.
Leaks and wet areas can be discovered with thermal imaging without destructive measures. The cooling effect of water shows up clearly in the upper corner of this room!