mutzgrila

What could I do to see that watter in the wall using a thermocamera with interior scan?

i used a moisture meter and identified water in part of the wall. I try to see this in a thermocamera when I was doing a inside scan. I know it's needded a difference of Temperature called delta T, so I heated all the wall. But it doesn?t work. Do I need to heat al the house?s interior or just the wall? Wich equipment could do that?