For stable, constant humidity and protection, I keep my guitars in a modified "guitar cabinet" that I made. I bought a 'Robin' storage cabinet from Ikea that was meant to store clothing. I installed a custom, home-made lower bracket system and used foam pipe insulation over the steel brackets to rest the guitars on a cushioned surface. Then I used those u-brackets that are supposed to hang up rakes and brooms on your garage wall on the back wall of the cabinet (mounted into a 2 X 4 piece of wood).
I made some mini humidifiers from those cheap plastic food-storage containers you buy at the grocery store. I bought some anti-microbal sponges and cut-to-fit them inside the storage containers. Then I drilled several large holes in the lids of the storage containers, fill the containers and popped the lids on 'em. I fill these containers with distilled water about once a month and put a cheapo hygrometer at the bottom of the cabinet to monitor the humidity, which always stays at 68% all the time.
Total cost of everything is about $175. The cabinet was only $99 itself, the rest was the other stuff I described. The cabinet will hold up to eight electrics and also has small storage areas up top for effects, straps, etc. Mine is set up for seven electric guitars and one acoustic. I also have a smaller cabinet that holds my other three guitars, which is basically the same set-up, only smaller. I installed some lights in the cabinet, too... also from Ikea.
Here's what it looks like (minus a couple guitars I took out to clean and polish). Sorry if the pics ain't that good, but you'll get the idea of where I'm coming from...
Guitar cabinet in the daylight:
Guitar cabinet with interior lights on: (..the little tiangular-shaped thing is my hygometer)
Bottom brackets with pipe insulation and "humidifiers":
Rubber-coated garden tool holders as "neck rests":
I decided to make this cabinet for four reasons...
1: It has doors that I can lock with one of those plastic "baby locks", which keeps my 4-year-old and one-year-old boys from messing with my guitars.
2: I play more often because it's easier to reach into the cabinet and
immediately pull out the guitar I want, rather than sift through a big pile of cases and gig bags.
3: My guitars stay preserved at constant humidity and temperature levels of 68% and 72 degrees farenheit.
4: My guitars stay clean and dust-free in the cabinet, since they're not sitting out on stands.
I know it's not perfect, but it does the job for me!
