Workshop Humidity control.

Hi,

We have a small 8x5 extension to the garage that acts as a small workshop and has a selection of metal tools etc which we try and keep as dry as possible.

To room is well insulated and no windows and am currently using the calcium crystal tubs to keep things as dry as possible, though no obvious condension it does feel as if it could be drier, so was looking at these little Pelitier type of Dehumidifiers, but they state its only for use at 15c to 30c.

When not in use the workshop temp can drop very low, so not sure what happens with these little units below 15c, do they reduce or just stop all together ?

Any suggetion on any better method of keeping the room as dry as possible ?

thanks...