We are seriously thinking of switching to a gas furnace, gas stove, and gas water heater. We presently have all electric appliances. Our home is 96 years old and small. We have a 3/4 basement with a generous crawl space and plenty of room for the furnace. I hate electric stoves; ours is old and large, but it will likely last a long time yet. The water heater is two years past its expected lifetime. The electric heaters are all old, except for two, and hard to regulate. Each one is a separate unit with its own thermostat. The only structural draw-back is that the dining room, back bath, and utility rooms are add-ons, and there is a thick cement wall in the basement around the main part of the house. Oh, and we have an existing chimney, but I do not know its condition. Any experience? Any advice?