Keeping grow room warm at night

My grow room is in a basement and since winter is coming up im worrying that its gonna get too cold when the lights are off for 12 hours... What can I use to keep the room heated?

Boneman said:

You can use a small temp controlled heater. They sell them at wal mart and are really cheap. I kept mine at 70 degrees all winter and had no problems. Mine had a lil red light on top. I placed a piece of foil tape over it so my plants didnt get any light from it at night.

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space heater? maybe kerosene heater to save on elec.