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Venus can be cooled down via the addition of a LOT of water, most of which would eventually disappear (with the heat) into high altitude geysers. But the planet has a retrograde rotation on its axis, and takes more than a Venerian year to make one full rotation. So, unless the rotation rate can be increased (even in a retrograde direction, although that isn't going to work long-term because of the tidal transfer of momentum), the only way Venus can be made workable for Earth life (and probably not for humans) would be the further addition of water, turning the surface into a global ocean. And cooling it down would take centuries, probably thousands of years.
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