I have the same issue with condensation. My garage is dug into a hill so the the concrete walls are normally colder than the outside air. My walls sweat so bad I thought the foundation was leaking. It turn out to be condensation. I installed a dehumidifier a few years back and it resolved the problem. I no longer have rusty tools. I do shut it down once the temperature in the garage goes below 40 degrees fahreneit.
Phil Moderator, The Engine Shop, Interiors and Project Journals
1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes Project Journals Stovebolt Gallery Forum