Some possible solutions: a portable electric roll-around dehumidifier (but you have to keep emptying the pan under it), a wall or window mounted exhaust fan that sucks dry air, say from under a slightly open garage door, out thru a window, a garage heater (in Denver we had hot water heating in the garage, as a branch of the heating system). You could also leave snowy cars outside long enuf to let it melt off, or just jet it off with a hose, and let it drip before driving the car inside. Look also at some way to get the garage air circulating, with fresh air coming in, or check that the roof and garden drainage around your garage is away from the foundation, and away from the garage, in all directions. Cheapest solution... Move the tools you care about inside.