Hey buddy,

You'll find people give you various advice, and various methods on this (and almost all grow related issues).
Most of the time there's several ways to do things, and which one is best is purely a matter of opinion.

IMO, you want a lot of air movement in the room. A simple cheap oscilating fan should handle that. IMO, keeping the room pitch black isn't a major issue.

Oh one thing i cant emphasise enough, you do not want your buds to get soggy in a jar and open them or whatever. This type of situation usually results in musty smelling (and tasting weed). I really, really wouldnt do it that way.
Even putting a large wad of paper towel in ur jars, and changing them as they become moist should help a lot. You could also you dessicant i guess, but I've yet to try that method, so i cant vouch for how good it is.

Regardless of what you do, follow a few basics and you shouldnt go too far wrong. Dont put wet pot into closed bags or jars. They'll sweat, and end up tasting pretty foul when they eventually dry. If you can find the balance between not drying too hard n fast (lose potency) and letting the weed sit with excess moisture for too long (especially if in a closed air space), then it should turn out pretty well.

I'd hang the whole plants upside down in that room, i'd probably stay clear of the closet with the heater, and i'd make sure i had a fan in the room. The humidity in the room (and your town/city) , the air temp during, and the amount of air echange in the room will vary the results. So keep an eye on it, and you should do just fine.

Good luck

Fingers