welcome to ergonomy: thermography – infrared thermal imaging
Infrared Thermography Inspections can see and measure heat that is emitted by walls, ceilings, foundations, electrical systems, steam systems, etc. The thermal images (thermograms) can identify a wide range of problems that are not visible to the naked eye. Damaged insulation, water intrusion, and electrical overheating all produce different heat signatures that can be easily identified a thermal imaging professional.
Buildings: heat loss and moisture/mildew issues
Thermal imaging of flat roofs 
Thermal imaging of steam lines
Infrared thermal imaging of electrical distribution