I'm sorry to hear about the mystery smell in your house. Without being able to physically inspect your home, it's challenging to pinpoint the exact cause. However, there are a few possibilities you could consider:
Plumbing Issues: Sometimes, foul odors can originate from plumbing problems. Check your sinks, drains, and toilets for any signs of blockages or leaks. If you suspect an issue, it may be worth calling a plumber to investigate further.
Hidden Mold or Mildew: Mold and mildew can develop in hidden areas such as behind walls, under carpets, or in damp areas like basements. Even if the visible surfaces appear clean, there might be an underlying issue causing the smell. Consider checking for any signs of water damage or excess moisture in your home.
Dead Animals: Occasionally, small animals like rodents or birds can find their way into hidden spaces within a house, such as crawl spaces, attics, or wall voids, and unfortunately, they may pass away there. If you suspect this might be the case, you may need to contact a professional to help locate and remove the animal.
HVAC System: Your heating, ventilation, and air conditioning (HVAC) system can sometimes be a source of unpleasant odors. It's possible that there could be a buildup of dust, debris, or even mold within the system. Consider scheduling a professional inspection and cleaning of your HVAC system.
Chemical Spills or Gas Leaks: Check your home for any signs of chemical spills or gas leaks, especially near areas where cleaning products, paints, or other chemicals are stored. If you suspect a gas leak, it's essential to evacuate your home immediately and contact the relevant authorities.
If the smell persists and you are unable to identify the source, it might be worth consulting with a professional, such as a home inspector or odor specialist, who can conduct a thorough investigation and provide expert guidance on how to address the issue.