I live in western Colorado, in a region called the 'high desert', which, as the name implies, is very dry. It's not unusual to have humidity levels of 10% or lower out here! So keeping my acoustic guitars properly humidified is very important to me. Since I have central A/C, my condo stays very dry during the summer months, when we have temperatures which reach over 100 degrees! Hot and dry weather: which is disastrous for acoustic guitars! I run a humidifier in my condo; mainly for my 'cheap' guitars, which I leave on their guitar stands. But I have to protect my expensive Martin guitars, which I always leave in their cases, with a better humidity solution. Which is why I started using the Oasis OH-1 guitar humidifiers. I was skeptical at first, because I was worried about hanging something which is filled with water, in the sound holes of my expensive acoustic guitars. But after using these humidifiers for the past couple of years; I swear by them! I fill them once a week ( I tell my friends it's my day to 'water my guitars' ), and I haven't had any issues with the Oasis OH-1 humidifiers. If you use caution by not over filling them, these humidifiers will keep your acoustic guitars at the proper humidity level. And always keep your good guitars in their cases. If you are conscientious about keeping your acoustic guitars at a correct humidity level, you're going to keep them in their cases anyway. The Oasis OH-1 humidifiers are a must, especially if you live in a dry climate.