Thermal imaging catches all the temperature changes. Before we have a cold moist wall where the vent was leaking. After the Demo we where able to find the leak in the vent, stop it by replacing and resealing. As you can see the green is a moist temperature. In the after photo you can see that the wall is a solid color Blue. This means the wall is dry. The area around the vent is also one color meaning no more water or air leaks. We can see if there is a draft with the Thermal Image Device. The color would change do to the movement of air cooling down the area it flows over.