Argon’s kind of the poster child for “energy efficient windows,” but honestly, I think you nailed it—it’s not a magic bullet. The gas helps slow down heat transfer a bit, and yeah, less morning fog is a nice perk, but if you’ve got drafts or poor insulation elsewhere, argon isn’t going to save the day.
I see folks get sold on upgrades like triple-pane argon units when their weatherstripping is falling off or there’s a gaping hole in the attic insulation. That’s money down the drain. I tell people: fix your leaks and address the big stuff first. Windows are just one piece of the puzzle.
That said, argon does have its place—especially in newer builds where everything else is pretty tight already. But for most older homes, you’ll get more bang for your buck sealing up those drafts and shoring up your attic. The window companies are great at marketing “argon-filled” glass like it’s some luxury feature... reality is, it’s just part of a much bigger picture.