What is Thermal Imaging? In short its a camera that takes pictures of temperatures and images. Its not an x-ray camera . It cannot see through things it only sees temperatures. It looks just like a camera but with a special lens. What is a Thermal camera good for? It sees temperature variations in objects that you and I cannot see. If you had a leaky roof where water runs down into your wall but not enough to show immediately , this camera would see the temperature difference on the wall it was behind. If there was a lack of insulation in walls or ceilings where cold or hot air were coming in through this camera would see the area where this was happening. If there was a heating or air-conditions duct not fastened properly and letting condition air escape this camera would pick this up as well.