Are wax-cube melting systems cheaper than scented candles?
Warning: Incandescent light bulbs were great for warming these. CFs and LEDs, not so much.
Also adding a nicely scented dryer sheet to the inside of the vent can provide the sort of long-term gentle scenting that the OP seems to be looking for. Change them every six months or so.
Also, let us know whether the room is carpeted or not? There’s a lot you can do with the right floor wax, or by adding stuff to carpet padding, but I’m not sure how to advise you on that.
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Most rooms have some permanent ventilation system. It can be a small grate or vent near the floor or ceiling. Or a vent built in the window sill. Building regulations require one…
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Must be a Dutch thing as that’s not the case in the US. Normally, the only source of outside air is to open the window.
Although, I have lived in apartments with old and worn-out windows that there was a permanent air flow. Brrr…
No smell IS good smell.
You seem to want ‘fake good’ smell.
If the OP wishes to permanently **scent **a room, that’s impossible. The volatile molecules that lift from surfaces in the room (and diffuse to your nose) will slowly escape, decompose, or react. This may happen slowly. But it will happen.
Well, the OP did say “semi-permanently,” which, of course, has no real meaning.
How about a month? A month would be good.
I burn a couple of sticks of Nag Champa incense a day in my den. The room has taken that scent on pretty much permanently