We have a gas furnace. Ive only had to turn it on once so far this fall.
We have central air & heat. Our heat runs off of natural gas. We haven't switched from A/C to heat yet.
Gas furnace and nope, haven't turned it on yet.
We have a central A/C and heater. I have turned it on for a little while in the mornings, but I usually still have the a/c on.