We have no central heating - a couple of gas fires and a couple of oil filled radiators. the best thing we did to the house was get the loft re-insulated.
As a consequence the upstairs can get very warm in weather like this so we have lifted the loft hatch lid out of the way and the hot air that rises is now lurking in the attic instead of the bedroom - the temp has dropped by about 3-4 degrees upstairs so bedtime is a little more bearable.
(And we have not been invaded by any attic monsters either)
we still use a fan, but have it on a timer switch. It also rests on a towel, rather than directly on a hard surface so it doesn't make quite so much noise.