Hi Georgette. It depends on the ginger. I think Costus needs warmth, if I'm not mistaken, but the others do well in cool not cold rooms. Humidity and fresh air are important. Additional lighting is very helpful for flowering.
Gingers need long days to bloom, so that's where arificial lighting is helpful. I use one warm and one cool white bulbs.
If you can keep African Violets, you should be able to get your Costus to bloom. Toni

I have them in the same area as the african violets (which bloom nicely) in the winter, but no bloom. will try under lights, but it is cooler there. thanks for the info.