I used to have a halogen heater and couldn't get on with it at all. It didn't seem to heat the air, only what was directly in front of it. They are used in patio heaters, which is fine for those sat underneath them.
This seems to back my experience of them:
"halogen heaters only heat the specific areas they are targeting so if a person is slightly away from that heating area, they will not be heated and will remain cold."
https://www.tansun.com/gb_en/technical/advantages-and-disadvantages-of-halogen-heaters.html
Could you just unplug your fan heater and move it to the kitchen/dining room when you want to use it there? It would probably be cheaper to run for an hour than putting the central heating on for an hour if you only want to heat one room.