Chimney effect in homes

I thought I de share this w you all . I ve had pull down attic stairs for years in the stair well to my basement for years and yes it always been cool or hot depending on the season . About 3 years ago while adding insulation to my attic now about a r 48 . After I noticed of course more comfort and a little bit of a lower utility bill but still had a cold stair well and a basement that really never was to warm .i decided to make a lid to cover my attic pull downs ,I constructed it of 2 inch blue board about 8 inch high so the stairs would fold up into them . Not only is the stair well and my basement warmer but both my gas and electric use is lower . The reason I post this is I suggest this to customers and they just stair at me and I let it go . I recently add one to a relatives home who suffers from high heating and cooling cost and a generally chimney effect to both there pull down attic stairs and there uninsulated undersized side wall return filter grill . Well it’s been about 3 days and the temp have see sawed from heat on in the am to ac in the afternoon and well they where dumb founded that there 20 year old house is comfortable because to a simple solutions like a insulated box over a attic access and the elimination of thermal migration and chimney effect it should be nice for them to see a saving in there ulitily bills and feel comfort . They wondered how come nobody has ever suggested it I said maybe because they really don’t care about your comfort and about saving you money . The whole lid and a roll of fiberglass scrim tape cost about 40 bucks I m pretty sure they will recupe there investment in one hot or cold month . Simple solution are sometimes not only the easiest but the only solution Peace and good luck clammy