Oil and reed diffusers!!! Be sure to buy ones that specify they are alcohol free or they'll be gone in a couple of weeks. The alchohol free ones can last six months to a year depending upon how often you invert the reeds and how many reeds you use (I tend to use only 6 or 7 reeds at a time and save the extras). I buy all of mine at TJ MAXX or Marshall's and vary them by season. I like complementary scents in different rooms but if only 1 bottle is available of something I like I'll just pour some into one or more bottles - extra reeds are available at craft stores.
I used vanilla, amber and sandalwood reed oil diffusers this winter and have switched to the beachy/coconut/seaside scents for the upcoming warm weather.
I enjoyed the scent and warm glow of candles until the tip of the cat's tail caught fire as he walked by a jar candle...
And even if you have no furry friends, candles also have the ceiling soot problem even with the little soot-gathering covers available - if you rent your home you may not care but as someone who appreciates bright white ceilings, I began to resent the candles after having to repaint.
Still occasionally use a room spray, usually the Asquith & Somerset ones on clearance from TJ MAXX, Marshall's or Home Goods (all owned by the same corp.) but I don't care for the way the moisture in the spray mist falls on surfaces, so it's oil and reed diffusers for me from now on!
Le cœur a ses raisons que la raison ne connaît point