In another topic I mentioned the idea of putting something like this http://www.ebay.com/itm/vivarium-heat-m ... 0716632488 into the cabinet where I store my filament. I ran into a moisture problem and this, I think, will help me and maybe you, hence this share
They also have a USA connector type and of course you can use any type or heating pad of heating fan, you name it. I intend to keep it on 24/7
Specification for the mentioned heating pad are:
1. Size: 15 x 28 cm,1 inch=2.54CM ,so this item is about 5.9 x 11 inches
2. Wattage: 7W
3. EU Plug
4. Rated voltage: 220-240V AC
5. Output temperature : 35 ± 5 Degree Celsius
Cheers