TNO = trans neptunian object, basically far out dwarf planet
Obviously there would be less sun to greenhouse, but theoretically could that be a way to have closer-to-earth habitats far away from a star?
edit: the TNO does not have to be like Pluto, it can be bigger or have different conditions
The greenhouse effect still has a limit to how much it can trap.
At the end of the day infrared radiation is still basically light.
Even on the cloudiest day, or when there is super dense smoke or ash, it is still not pitch black out. Some light gets through. If you are looking into a mirror, it might seem like it reflects 100% of light. But they only reflect around 95%.
You would require something which can let through 100% of all sunlight, but still trap 99.5% from leaving.
You could have a look at how one-way mirrors work, to understand the percentages of light passed through and reflected.