This homeowner in Manassas was having trouble cooling off the top floor of their home which is a two story rambler. We counted 24 recessed lights allowing the hot attic air into the home, and the cooled air from the home into the attic. Do the math....each 6" diameter recessed light is a 28.26 square inch hole in the ceiling. 24 x 28.26" = A 678.24 square inch hole allowing air to transfer to/from the attic and the living spaces below. Cut a hole that big in your ceiling and tell me it doesn't affect your ability to heat/cool a home!