We are in the process of replacing our dead boiler and are using a Maine Efficiency program that gives rebates (getting a $2000 rebate, so 6K boiler with boilermate install will be 4K - SWEET!) A person had to come and do a pre-installation check as required by the guidelines of the program. He started pointing an IR thermometer at my walls and found a cold spot - we have blown in rock wool but have found gaps during renovations ourselves - I know they are trying to push me into a full house audit ($600) so I can do weatherization also. But you have to have it done by a contractor which is not gonna happen since I can do it myself. But now I am very intrigued by getting an IR thermometer myself. Has anyone here used their IR therm for this and gone in and actually found that the cold spot was indeed a void in the insulation?? If so, I'd like to hear what you discovered.