ive lived in a few houses....all of them that werent carpeted in the living area, eg.. woodfloors, slate and now floating floors, all have had a fireplace, which works wonders...but obviously not always an option.
in the houses ive lived in with carpet i have used electric heating and gas heating. found gas is better =)

ive always just put on extra layers of clothes, mainly socks etc...

you can use the option of electric blankets, but i dont like them cause yea dont like being hot in the bedroom.

hope you work something out!! (i feel like i havent really helped...sorry)