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humidity in garage
The first thing is to understand the problem.
Your concrete floor is well connected to the cold earth, meaning that, especially overnight, your slab floor gets quite cool.
Then because of it's mass, and the facts that it's both in the shade (inside the insulated building) and still connected to the cool earth, it warms up MUCH slower than the surrounding air. The result is no different than putting a cold bottle from the fridge on the table. Just watch the droplets of moisture form.
Now, the simplest solution is to have something even colder, or at least more able to deal with the moisture.
If you are handy, all you would need to do is make up a simple dehumidifier. This need be nothing more than a shallow well supplying water to an old car radiator in a plywood box and push the air through it with an old furnace blower.
I basically air condition my shop at home this way. I can lower the temperature by 10° - 15° and the humidity by probably 30% just by running it during warm weather.
You could also just put in a few ceiling fans and a commercial dehumidifier.
Either way, the trick is not to vent the building, this will just bring in more humidity from outside, but rather lower the relative humidity inside the sealed up building.
Best of luck.
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humidity in garage
Kenneth, yes, it's basically a home-brewed geothermal system.
The water table in my area is very high (about 5' below grade where the shop is) and the ground is very sandy, I can pump water nearly non-stop and not run a 10' deep dug well dry most of the year.
I pump water out of the well (actually a 12' long piece of 2' dia. steel culvert standing on end in the ground) and run it through the rad. then it (and any condensate I don't use) go back down another 'well' (another piece of culvert) and back into the water table.
Jeff, in my case the shop is a concrete slab on grade, with an insulated wood frame, steel clad building on top. In the summertime my slab is ~60° - 65° first thing in the morning, during the day (with the south-facing bay doors closed) it will only climb to ~70° even if the outside temp. is in the mid to high 80's. In such cases there is moisture visible on the slab without my system running.
Best of luck.
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