I have a finished old farm attic that has electric boxes on the ceiling. I was using a thermal temp gun and noticed at each box there is a 15 to 20 degree difference in temperature. I have sealed around the boxes but that did not do anything. I know there was insulation above the boxes before sheet rock went up so I am not sure why there is such a big difference. Does anyone have ideas how I can get more insulation around the box now that it is finished. I was thinking about drilling a hole in the box and pumping foam above it. Not sure if that is a good idea though. Any thoughts would be appreciated.