The value of a thermal imaging camera
If you look in the upper right corner you can see a small digital pic of the thermal image. In one instance I brought it to the full screen so you can better appreciate what you see.
What you are seeing is ceiling pics, a bathroom fan, basement window and fireplace. Pics were taken earlier today when outside temp was about -11C (yeah I know the time on the cam is not set properly - I'll fix that). His furnace was working at the time I took the pics.
EDIT: Pic 2 is the digital image of pic 8.
Time will cease to exist when there won't be a soul left in the Universe.