Last year I successfully overwintered several plants. I squished them up near two west/NW facing windows. The room was cold on cloudy days (~60 F) and warm on sunny days (70-80). I did not do anything special to them besides just moving them inside (they were already in pots). I did not fertilize throughout the winter. I let fruit ripen that was still on the plants. I trimmed them once or twice when new growth got too big. Most of them I trimmed before setting them back outside in May.
Some other observations: I left the chinensis out in the cold too long, it took them a bit longer to "recover", I will bring them in earlier this year. When the days started getting longer again, especially in February my plants began flowering again, They even set fruit which I did not remove. Sure enough I had fresh cayennes, orange habs, and a few others in March and April. The pods were a bit smaller than normal, but still tons better than store bought! I battled aphids throughout the winter, but it was worth it in the end. Instead of waiting until October/November for ~100 ripe piquins from several plants, I just harvested several hundred from one plant in August!