The thermal span in this image is an overly wide 80°F, which has the effect of clumping temperature variations in the area of interest into a very narrow color band, washing out most detail.
At the other extreme, too narrow a temperature span makes some areas appear white hot, while adjoining surfaces — which are really only a few degrees cooler — appear to be extremely cold, obscuring smaller but significant variations.
When the correct span setting is chosen, such small variations are clearly visible.
Setting a camera level too low makes the resulting image appear "too cold."
Too high a setting will push most of the image area into the range at the high end of the scale.