There’s something about the cold of winter juxtaposed against the bright, tangy aroma of citrus that makes the scent of oranges extremely appealing at this time of year. Using citrus essential oils, you can bring these aromas into your home. For example, the essential oil orange is stimulating to our senses, according to herbalist Brigitte Mars, author of The Country Almanac of Home Remedies (Fair Winds). You can use it to brighten up a room and make it feel less stale. Put it in the living room or dining room—and it might just perk up the conversation. One way to use an essential oil in a room: Put four to 10 drops on a cotton ball, and place in a small bowl.

A whiff of two essential oils—either rosemary or peppermint—will stimulate your brain and enhance your concentration and focus. You can buy essential oils for about $6 to $12 for a half-ounce bottle at health-food stores or online. Keep these small bottles handy for those moments when you need a quick lift. Sniff lightly at first—they’re powerful!

When you inhale an essential oil, your olfactory system gets a specific message. With mint, that message is a surge of energy. In a small space, such as a bathroom, put four to 10 drops of mint essential oil (available at most health-food stores and online) on a cotton ball, and leave it in a small dish or bowl. Every time you walk by it, you’ll feel uplifted.