Thermal question

Using the Thermal Camera mentioned in the post on Compost Duvets for its proper purpose i.e looking at the insulation on the house, one thing stood out.  The thermal image showed a much lower level of heat from the part of the house covered in Ivy. Does this mean that Ivy is a great insulator or is it that it absorbs the heat and so shows up as cooler on the camera, but does not help keep heat in the house?  Any experts out there who can advise on this?

Here’s the Thermal Image.

Insulation Ivy on the left

Insulation Ivy on the left

Here’s what it looks like normally.

Ivy clad

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