zlacker

No, they aren't. Most houses that I've been in have electric heating, but not central heating. Folks heat each room seperately. Occasionally, it is baseboard heat. More commonly, it is portable heaters or electric panel heaters hung on a wall and plugged into a socket. Heated floors in the restroom are fairly common.

I personally have a small attic apartment in Trondheim (Norway). It has bathroom floor heat and came with one wall panel: I actually just use one oil-filled electric radiator and keep a fairly cool bedroom. Wood heating is pretty common too - one of the scents of fall is the lighting of fireplaces.

That said, more central heating is starting to become popular in the form of heat pumps, but I honestly only know one person that has one - and they are on a farm in the countryside instead of here in the city.