My small house was built in 1926 and has never had any kind of heating system, other than space heaters. I heat it with two of those oil-filled radiators on wheels that you plug in.
EDIT: I forgot that originally it had wood stoves in each room. Senior moment.
Woke up this morning and it was -3F outside, WC -20. In my unheated bedroom, it was 46F. The heated parts of the house were at 48. I also have to heat my crawlspace so the pipes don't freeze, when it gets below about 20F. And below 32 I have to keep a tap trickling so the short above-ground section of pipe in the detached garage doesn't freeze. That section is above ground because it has a shutoff valve and a spigot. It is heavily insulated, but still.
Old-school living. Fun times!
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Today is the lowest temp day for this cold cycle, so it will only get better. Max temp today is 6F.