What causes this smell?
Hubby and I have lived in our 100-year old farmhouse for about 2 years now. One of the upstairs bedrooms, as well as the attic, have a puzzling smell which I can't figure out what might be the cause. The odor is very sweet, like maple syrup; it's always faintly noticeable, worse if the room door is kept closed for a while. It doesn't seem to change based on temperature or humidity fluctuations, etc. It's not the least bit offensive, just very obvious and peculiar.
There's nothing unusual about that bedroom, except that it doesn't get used very much. (But we have another guest room next door to it, similarly-unused, which has no aroma.) Flooring is the same throughout the entire upstairs (hardwood, not sure what kind), walls are plaster, no discernable leaks, etc. It's been like this since before we moved in, when there was nothing in ANY of the upstairs rooms, so I don't think it's our furniture, either.
The attic smells the same as the bedroom in question.