Some people do live in pop-up campers in the winter, but it’s not recommended. Pop-up campers are not designed to be lived in for long periods. They’re meant for short-term camping trips. If you live in a pop-up camper in the winter, you’ll need to take precautions to keep yourself warm.
This includes insulating the camper and using a space heater. You should also make sure that the camper is properly ventilated to prevent condensation.