[Spirochete]

With air conditioning, everything 125 and below would be habitable, giving us a planet that would support human life over most of its surface.

All this assumes your Venus has the CO2 level we now have on Earth. If your hypothetical Venus has lower CO2 levels, it will be much cooler.

If it has minimal levels necessary for photosynthesis (about 10 ppm), the global average temperature will be around 300 Kelvin / 81 Fahrenheit.

[Arthalion]

True, but I've always made the assumption that anyone attempting terraforming of Venus in the distant future would also like to grow crops and plant shade trees. Larger plants like these require a higher atmospheric CO2 level. It's an interesting point though...I wonder where the "balance" would be, and how low we could actually drop the CO2 levels before agriculture lost its viability.

[FreedomCalls]

There's a habitable zone in the upper parts of the atmosphere where there is a 70°F temperature inversion layer. You would still have to deal with that pesky sulphuric acid rain, but if you could float a balloon at that level you could live there easily.