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Fire
Definitely drop £1-200 on a graphics card and get BOINC running, guaranteed a warm room then.
GTX 480
I kid you not, it dries the washing on the clothes horse, and if you fancy a burger................
Well done you've just removed the item that transfers the heat to the room, increasing the heat output of the CPU is useless if you don't have a way of transferring it to the air in the room. Think about it, removing the radiators from a house and turning the boiler to full isn't going to do anything apart from giving you a very hot boiler.Sell your CPU cooler then overclock it loads and spend the £200 on a better graphics card.