We have a smell in an old house we bought. It smells sweet and musty and is nauseating. I didn't notice it initially but once we heated the place with a wood stove and 2 electric baseboard heaters it really started to smell all the time. Is there a spe******t that could help us locate the source of the smell. It's a 200 year old house that has a septic tank and much of the original wood. The previous owners used alot of foam insulation to plug up any and all crevices, holes and cracks and there is a substantial amount of yellow insulation in the chimney around the insert for the wood stove. The bathroom also has an slight odor of sewage. My husband is replacing all of the windows and has painted the upstairs and has also added a small closet but nothing has helped with reducing the odor. We have used charcoal, an ozone purifier, and air fresheners. the basement smells musty but does not have the same sweet sickening smell that the first floor has. We are looking for a professional that can help us figure this out.....