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Why does my furnace create an odor when running? This is my 1st winter in a cottage that I am renting. Every time that my furnace is running, there is a bad odor throughout the basement where the furnace is located. It smells pretty bad. My neighbors have the same problem. My neighbors house is the same as mine and has the same owners. The furnace is really old also. What is causing this odor? It's a gas furnace. Maintenance & Repairs - 4 Answers - 2009-01-08 12:26:26 Best Answer Dirt and dust often collect in the furnace during the summer when it is not used, then when it is run for the first week or so, it will produce an odor that's not pleasant. But if the smell persists, then maybe mice have gotten into it and made their nests. You may be smelling the mice urine and droppings as it all heats up when you run your furnace. It would be a good idea to inspect the furnace and the duct-ways for evidence of mice nests or other debris including mold. All Answers Answer 1 Is the fan sucking air out as a chimney does? If it's oil, it's smelly. But hey, don't play with this...get it corrected!!! We need to know what the fuel is herein! 2009-01-08 12:35:52 Answer 2 Dirt and dust often collect in the furnace during the summer when it is not used, then when it is run for the first week or so, it will produce an odor that's not pleasant. But if the smell persists, then maybe mice have gotten into it and made their nests. You may be smelling the mice urine and droppings as it all heats up when you run your furnace. It would be a good idea to inspect the furnace and the duct-ways for evidence of mice nests or other debris including mold. 2009-01-08 12:39:03 Answer 3 could be the furnace flame is irregular and "rolling out" of the front of the burner compartment and putting carbox monoxide in the air or burning wires or controls.or the chimney is clogged and fumes are coming into the home.....they say you cant smell carbon monoxide but often there is an accompanying odor that is unusual and offensive..best to get the furnace checked asap,,also get a carbon monoxide detecter,,should have one anyway............dan 2009-01-08 13:17:36 Answer 4 there might be some bird stuck in the flue pipe from the inducer fan motor. 2009-01-08 15:51:25 |