Yeah, try to keep night temps above 65 if you can. I know you outdoor people don't usually have a dedicated indoor grow area that's ideal, but preventing drafts is a good place to start- I assume most outdoor growers are sticking stuff for spring in your unheated 3-season porches, sunrooms, basements, that guest room that's too cold to use, the garage... lol! Any little bit of insulation can help a lot. If it's a corner of the basement, consider hanging plastic sheeting to trap more of the ballast heat.