One more point I recall, when you put recessed lighting in a ceiling below a roof crawl space, such as third floor ceiling below an angled roof, the openings you cut in the roof and the recessed fixtures make a less than airtight gap.
Not sure where you live, in the northeast and NE for tightly insulated homes it's common to address this, they make these flower pot looking things that sit above the recessed fixture to make an airtight seal. At the moment I forget the actual name of them, some contractors build them up in house and put them in.
All this applies to crawl space only, where conditioned air is below and unconditioned air is above.
“The best argument in favour of a 90% tax rate on the rich is a five-minute chat with the average rich person.”
- Winston Churchill, paraphrased.
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