What’s Your Favorite Way to Freshen a Room?

Wintertime is my favorite time for burning candles.  It's also my favorite way to freshen up a room in the house.  I love the aroma of cinnamon and vanilla, and by springtime and summer, I prefer tropical or citrus scents.  Excluding the bathroom because you'd normally use a spray to get the stink out immediately, What's your favorite way to freshen a room?  Do you use:

A.  Room spray

B.  Candles

C.  Plug-ins

D. Disinfectant cleansers

E. All of the above

F. Nothing