Warning, geeky stuff follows.

For condensation control you need to keep the temperature inside the garage above the dew point. If you're a tinkerer a cool way to do that would be to rig up a dew point sensor to a dehumidifier. When the temperature/humidity/pressure falls below dew point moisture will condense. If you could find a dew point sensor with closed contact outputs it shouldn't be too hard to rig it up to turn on a dehumidifer when conditions are such that condensation will form.

For maximum energy savings you could use two dew point sensors, one inside and one outside. If the outside air had a higher dew point than inside you could bring outside air in. If both inside and outside are below dew point then close the vents and turn on a dehumidifier.

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