I agree ... I live in a newer building, so there aren't too many drafts, but if both the gas and electricity are out then there's not a whole lot one can do to keep really warm.

Anyway, if I had to "bug in" without heating options, I might try to use the bathroom -- it's the smallest space in my 1 BR Manhattan apartment that I can essentially enclose, since the bedroom closet doors don't shut very tightly and there are non-closable louvers on the kitchen door. My Nuwick candle (plus all the sheets, blankets, duvets, coats, etc. at hand, piled into a nest) might be enough to take the edge off a cold winter's day/week if the building's heat went kaput. (Besides, the smoke/CO2 alarm is right outside the bathroom door, so I hope I'd get a warning if the candle was causing problems.) I'd rather have a WBF (wood-burning fireplace, in apartment-ad-shorthand) of course, but one normally only finds them in the more-expensive pre-war apartments that I really can't afford!