Thermal imaging helps us detect changes in temperatures which can detect such problems as insulation defects, electrical faults and overloaded circuits. It can also locate heat and moisture in walls, floors and ceiling cavities that can present potential health hazards due to mold growth and other environmental issues. Thermal imaging cameras are also used to quickly detect structural damage in buildings and to detect wildlife. Thermal imaging can be used in surveillance and security applications, to identify people in the dark and can be useful in search and rescue scenarios.