We now have central heating in our house. The heat is provided by a natural gas furnace and distributed around the house through ducts in the floor. We split the house into two zones so the living areas run to a different program from the bedrooms.
So far it hasn't been too cold so it hasn't been on very much. It is nice when it comes on in the morning though. It makes it much easier to get out of bed!
The furnace sits under the house.
Floor duct - there is one in each room including the bathrooms.