X-ray vision? Not quite. Infrared cameras are not able to see through walls. However, they are able to detect and measure the surface temperature. Consequently, this provides information about what is happening behind the surface.
Thermal imaging, also known as thermography, is useful for finding hidden water leaks or moisture intrusion issues. For example: roof or siding leaks. As a result, you can stop the issue before staining or other damage is visually evident. Water or moisture will show up as a colder area. Afterwards, these areas can be further investigated with a moisture meter to verify.
Thermal Imaging can also be useful in assessing the thermal efficiency of a home. Hot and cold surface temperatures can be used to find air leaks. Likewise, this can help locate missing insulation or find out if doors and windows are inefficient.
Electrical or mechanical equipment problems can also be identified with a thermal camera. Excessive heat can be a sign that equipment is experiencing a problem that should be addressed before it progresses.