We moved to Lenexa from Milwaukee, WI. We were used to humid summers and dry winters. We also were accustomed to having heaters with humidifiers built-in. While some folks in Kansas might bother to do this, it's more of a Northern Midwest thing to do, I assume. Therefore, we resurrected our whole-house humidifier in order to try to counteract the dry winter air.
Actually, let me rephrase. The winter air in Kansas has not been all that dry. It's just when you heat air and don't add water vapor, the result is a higher temperature with a lower percentage of humidity, since warmer air can hold more moisture.
My body has gotten just as dry down here as in Wisconsin, which means a lot of lotion. And cold lotion is not fun to put on daily. I bought a cheap humidity monitor at the local home store. I can't tell what it's registering, so it was a waste of several dollars. The AcuRite 00613 Indoor Humidity Monitor seems to be a better option, so if you live anywhere that requires heat in the winter, I would recommend an item like this to help you decide whether or not you need to add a whole-house humidifier.