What we've found about insulation is really cool. Insulation sealed in a box (six sides) works really well and insulation in a space where air blows through works really poorly. Now whatever the situation in your walls sealing up the holes makes them work lots better. You can't always get to the outside of the wall, it has siding or brick, or something in the way. But what you can do is seal up the holes on the inside. Outlets and light switches, and ceiling fixtures are places where air can and does come in and out when the pressure changes in your home. The fix is relatively easy, even for do it yourselfers. Got to the home depot or lowes and get some outlet gaskets. Take off the covers, put the gaskets in and you're good to go. Then take some clear silicone caulk and seal up around your leaky light fixtures. I've seen how much these things leak during a blower door test, and the good thing is that it's an easy fix.
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