Nana2two: I live in a small house, built in the 1960s. In principle, it should be easy to heat but with the British weather being what it is (when it's cold, it's wet and/or windy, when it's windy it's cold and/or wet etc. etc.) the house does cool down quickly. I have the heating on for an hour at wake-up/get-up time, then on timer for the evening, from 6.00pm to 9.30pm.
I have gas-fired central heating - radiators in all rooms and in the entry hall, each with its own thermostatic control. Nevertheless, IF I know I am only going to be in one room for most of the evening, then I will only heat that room. In the sitting room, I have a free-standing electric stove
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Should I be going to spend all the evening in the kitchen-diner, I have an oil-filled electric radiator which I can wheel in from the bedroom - or the study - or wherever I last used it.
I can recommend this principle: if you can bear the discomfort of crossing the other, un-heated areas . . .