Your home comes apart at the seams. In winter you can literally watch your home come apart. Hardwood Floors separate at the seams.
Gaps appear in moldings.
Furniture and collectibles shrink, warp and crack as moisture is sucked out of them by desert-dry indoor air. Musical instruments drift out of tune. Desert-dry indoor air literally pulls moisture out of wooden musical instruments, which can cause them to shrink, crack and go out of tune. A humidifier not only preserves the beautiful finish, it can reduce the need for frequent and costly retuning. Dry air can aggravate upper respiratory problems.