I put a car air freshener on the air conditioner since we run the fan on the air conditioner all the time. I figure instead of lighting candles while we are not home use this!! We used the febreeze brand that we bought a 2 pack for $4 and they last for 30 days.: Cars Air Freshener, 29 Hacks, Diy Crafts Ideas, Creative Ideas, Frugal Clean, Rooms Sprays, Clean Freak, Households Ideas, Cars Vent