Last year some kind soul set a heater to running in our bathroom. It helped, even though with two un-doored entrances it didn't help all that much.

Heaters in other rooms, unless they were right at one's feet, would help hardly at all. There ain't no glass in them there winder holes.

I just had a bright idea- today I'm taking the bus to our Outdoor Outfitters and I'm getting a couple of heat seats, and maybe some hand warmers. Ooooo weeee, bring it on!