Some houses have heating, some don’t.
I once lived in a house where the engineer blew the entire electronics of the boiler and refused to come back and sort it.
so no heating with a huge 3 storey house and minus 5 outside. We borrowed and brought electric heaters and plugged them in - but it was worrying with a toddler etc
they had to be left off while we were out - they weren’t efficient - yes they heated up one room fast but off it dropped and you had to keep turning them on and off.
despite a heater in most rooms, there wasn’t one in the bathrooms and I remember a glass of water froze.
I slept with my daughter and dog in a bed with hot water bottles.
The electrician who blew my electrics never returned apart from the not turn up in court to refund my original payment (just a maintenance check) and I was awarded a bit by the court for heating costs.
at the moment is it mild - I’ve woken up at 8 am and it is always 11 outside with a high of 17. That’s fine for us.
I have put the heating on once or twice for an hour to make it go from 15 to 18 - takes about an hour and then it goes off.
but it is not minus 5 outside.
my experience even with multiple heaters was this:
plug in / central heating cost money lots of money at the moment
some people don’t have the money or the heating
it is truly crap to live in a situation where the temperature outside is minus
our bodies at 36 /37
children in particular find it hard to moderate their temperatures
I had one brief period 2 weeks back 12 years ago with no heating but electrics - yes we were lucky we had electric heaters and we had hot water bottles and a modern insulated house - but with it minus 5 outside it was dire
the cost is real
some people can’t afford rent never mind heating