Roy Noyes replies: To prevent rust on tools, it is necessary to understand how it is caused. Contrary to general opinion, rust is not caused by moisture in the air — there is moisture in the air all the time. Rather it is caused when the moisture in the air condenses on the surface of the tool. This occurs when a cold tool is exposed to warm air. If the tool is below the dew point of the air, condensation occurs.
I worked for many years in an unheated shop in my barn with no rusting problems. I used three methods of rust prevention:
I suspect that one of the major causes of rust in your shop may be leaving the cellar door and/or windows open in the summer time. However, you can prevent rust by following the steps above.