Sheryl, unless your plants are outside, your house will have about the same humidity as any other. We have central air/heat here, and there is practically no humidity inside the house, regardless of the season. Our heating and air-conditioning wrings all the humidity out. I remember my grandmother, sixty years ago, keeping a large pan of water on her stove during the fall and winter months, keeping the water just under boiling, to raise the humidity.
I just mist my "inside-the-house" orchids every few days and water them well every week or so. Also, my plastic or clay pots sit in decorative ceramic orchid pots with built-in saucers. The saucers are below the level of the pots so the pots cannot touch those saucers. I keep the saucers full of water to raise the humidity around my plants. The growing conditions of my outside plants, whether in the greenhouse during the winter months, or hanging under trees during the spring, summer, and early fall, is a whole different ballgame. Lots and lots of humidity here in Mississippi for those outside plants. Ken