- An oil smell blowing into your home when the furnace kicks on can be caused by a clogged oil filter inside the furnace. Your furnace may also be low on oil, which allows air to enter the system. This extra air can carry the odor of oil into your home when the furnace runs.
- You can repair a clogged oil filter by washing it out or replacing it. If your oil furnace is low on oil, filling it with fresh oil will stop extra air from mixing with the system and keep the smell of oil out of your house, according to "BTU Buddy Notebook," a guide for HVAC technicians.
- You can prevent the oil smell from coming back by performing regular maintenance on your furnace. Check the oil filter on a regular basis and clean it when it becomes overloaded with oil. Do not allow the supply of oil inside your furnace to fall very far. Keep a supply of fresh oil on hand so you can refill it as necessary.
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