What type of light fixtures create compromises in the heated envelope of the house?

What type of light fixtures create compromises in the heated envelope of the house? incandescent lights exterior spot lights interior cathedral ceiling pot lights or track lights??????

Public Comments

1. Every fixture that is mounted on a wall or ceiling that is adjacent to the outside can compromise the building envelope. We usually examine the envelope from the inside of the building, but exterior lights, because they may penetrate the air barrier, can be a problem. By far, the worst fixture is a recessed light that penetrates an attic (suspended ceiling or cathedral - doesn't matter). They are easier to fix when installed in suspended ceilings, but it is still possible on a cathedral ceiling.