I read an article recently claiming that space heaters in the bedroom didn't really save money in that the cost of electricity to run them costs far more than central heating.
I was skeptical of that assertion.
A few years ago, I installed a window a/c unit and was shocked at how much my electric bill went down!
Anyway, a couple of months ago, I bought a small, ancient, GAS space heater for ten bucks at an auction. Over the last couple of weeks, I managed to get gas piped from the meter to the bedroom wall Luckily, the master bedroom wall and the meter are on the same side of the house, about 14 feet apart.
I then fired up the heater and, Lord, does that sucker put out the heat !
My additional aim is to continue the piping to the back of the house and around the corner so that I can convert my portable generator to tri-fuel instead of having to rely on gasoline.
Point is, even if the original article was correct (which I doubt), there may be alternatives to heating the whole house - other than the central unit - for eight hours while you sleep.
Of course all this is a worthless endeavor on my part if we never again experience cold weather ...