If your home has recess lighting on the upper floor (as this home does in Herndon, VA) then the hole that your lightbulb goes inside of is protruding in the attic. This hole can be a point of leakage of the conditioned air from your living spaces into the attic. This can be part of the issue if you are experiencing hot top floors and drafty rooms. The more alarming issue with can lights, is the fire hazard they become if not installed and insulated properly. We install TiteShell Covers that are fireproof covers for these can lights that are insulated first. This acts as an insulating and fireproofing agent!