One of the biggest problems is heat rejection. It’s not enough to keep out the heat from outside the suit, you also have to eject any heat from within the suit, since as mammals, humans generate heat all the time and will heat up to dangerous levels if they can’t get rid of it (it wouldn’t be such a problem if we were reptiles). That’s not easy when the outside temperature is far higher than the inside temperature.

However there is a way to answer this question by taking it in an unexpected direction. Not in a spacesuit, not for long but in a habitat or even a domed city.

First, go to Mount Maxwell, pressure of 60 bars instead of 90 bars and temperature 320 C instead of 450 C

The 60 bars is a pressure that humans can live in breathing hydreliox, a mixture of hydrogen, helium and oxygen which helps prevent Nitrogen, Helium and Hydrogen narcosis. Divers have been able to survive at over 70 bars Technology: Dry run for deepest dive These gases conduct heat six times better than air which makes it comfortable to work at 33 C instead of 22 C.

So we now have 300ºC delta, instead of the 470ºC delta for normal surface operations with ordinary air at normal pressures.

And you can cool the inside even with much higher temperatures outside, with active cooling with a Stirling cooler Beyond Earthly Skies - Cooling a Venus Rover.

Or you can use thermo acoustic cooling which lets you cool with a much greater temperature difference than for a Stirling cooler.

The lower temperature also means you can have silocones.

Also - the larger the base, the easier it is to keep it cool, because you have a larger volume enclosed for the same exterior area. If you put your city under layers of rock, then the thermal conductivity of rock is so low that it would take a long time for external heat to diffuse into it. So combine that with thermo-acoustic cooling and you could end up with a domed city beneath the Venusian surface that can stay cool enough for humans indefinitely.

The first cooling for the city would be huge, but if you can achieve that, then from then on it will be easy to keep it cool, and also to reject the heat generated by its citizens.

This is based on comments to my article Will We Build Colonies That Float Over Venus Like Buckminster Fuller's "Cloud Nine"? mainly by Jason Mills and Priusmaniac