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Hi cheap40
sounds like your floor does not have a vapour barrier below? or insulation? so if you heat the floor you may still find at random times there is condensation. One of the above posts mentioned ventilation. This requires a small fan continuously moving air from the shop to outside. This solution will be less costly than heating the floor or insulating the floor, but will work!
Whats happening is the moisture is weeping up through the concrete, and condensing. So if you can change the air quickly enough during the wet times? you will keep the problem in check.
The cooler outside air contains the correct amount of moisture for the local conditions, all you need to do is raise the air temperature in the shop slightly and the moisture is taken away by the exhaust fan?
Or better yet, if you want to spend a few dollars, have a heat recovery ventilation system installed, this system will recover some of the heat lost on the exhaust side?
Summary: if your floor is not insulated, or does not have a vapour barrier installed it will sweat, unless you keep the garage really warm! (this costs alot of money, because you are pumping heat into the frozen ground) The option is to ventilate a cooler garage!
BTW: you can't open up the doors and ventilate you will have to provide some heat and a minimal amount of ventilation for this to work!
Cheers and good luck
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