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Can Can any animals such as mice, chimpmunks, squirrels get into your chimney or any othe vent opening? Occasionally these things find a way in, usually down the chimney, get trapped and die. Other possibilities include a pet consistiently urnating by a register or return grill, or standing or stagnet water that has been spiled or leeched in and created some variety of mold. If possible check you chimney where it meets the exhaust from your furnace or gas water heater, remove your air filter and inspect as much visually and scent to determine the area. You can try putting an air freshner (like the ones for cars). If all else fails call a chimney sweep or heating/cooling shop.

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Q: Why is a foul odor coming from the cool air return vent when the heat is turned on in the house?
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