Strange smell in my bedroom?

I decorated my room about 2 months ago and i have also put a new radiator in and recently i can smell this strange smell i don't no what it smells of i fort it might of been the paint but it was a whole 2 months before the smell has come. Nothing changed in the bedroom it has been empty since i decorated. It has been hot were i live for about 2 weeks but the smell has only been there for about 3 days so what could it be?