Has anyone had any experience with room humidifiers for guitar storage?

I don't mean the ones you can buy at Walgreen's for $20. I need something that is fed from a water supply and can be left to maintain humidity in a guitar storage closet for months at a time.

I have seen some wine cellar units that would suffice, but they are asking thousands.

I just need a little unit w/ a humidistat to service an 80 sq ft closet, and would cost less than a thousand.

Thanks

Lionel