Here we discuss the hornady gun safe dehumidifier canister Reviews. How much moisture is in the air in your safe? The answer depends on where you live and the weather. In most cases, the safe and its contents are never exposed to moisture. However, if you live in a climate where it gets hot and humid, then the air in your gun voltage is likely to be damp. Moisture can damage your gun safe accessories and even your firearms. One way to prevent moisture damage is to use a dehumidifier. There are several models on the market, each of them with its own benefits and drawbacks. A good and reliable dehumidifier can make it easier to prevent moisture damage.