Reading an article on the suns website about asda changing its signs to blue due to it being a rangers town and celtics colours are green and white.
At the bottom it says cable boxes were painted grey because of it as well LOL
So it turns out its nothing to do with cooling etc they painted every box in the country grey because Celtic play in green.
Link -
HERE
quote - " And when cable TV boxes in the town were painted green, there was such an outcry that the company changed the colour to grey".
Thought it was funny haha