Not in the upper atmosphere, where temperatures and atmospheric densities are close to Earth-normal.
I think living in zeppelin cities would be logistically difficult for other reasons, but as long as you don't need to go down to the surface you don't need extreme cooling systems.
If you did want people to be able to live on the surface it is kind of an interesting question how you'd manage it. Presumably there'd be ample wind energy available if you can just build a wind turbine that doesn't melt in that environment.
Keeping things aloft is costly too! But the solar radiation should be favourable there, there might be a solution where you have a solar powered aircraft that always stays on the illuminated side of the planet.
