Eight Weird House Smells To Worry About

When you're used to your house smelling a certain way, unexpected odors can throw you off guard. It’s easy to tell yourself it’s probably nothing, but you may be wrong. That’s why it's important to know the most common weird house smells you need to worry about.

The most worrisome household odors include sulfur, rotten eggs, and sewage. Sulfur and rotten egg smells can point to a natural gas leak, which is dangerous and requires professional attention. Sewage odors can indicate a sewage leak, but it may be something as simple as a dry p-trap. Simple smells, like stale air, typically indicate dirty air ducts.

As you can see, some weird house smells are dangerous, while others are signs of maintenance issues. Follow along as we highlight eight weird house smells that you should pay attention to.

Eight Strange House Smells And What They Mean

Some smells in your home are normal, while others can be harmful or signal home maintenance is needed. To know the diffeeence, you should familiarize yourself with some common, potentially dangerous household smells.

1. Musty/Earthy

An earthy smell can be nice, but once it gets musty and you notice it at home, you may think twice about what it means. A musty odor typically indicates the presence of moisture, and more importantly, mold. Mold releases microbial volatile organic compounds (mVOCs), and that’s what you’re likely smelling. This smell may seem insignificant at first, especially if it’s confined to one room.

That said, the problem with mold is that it can spread quickly and without prejudice. Mold spores are undetectable to the naked eye, but they can travel through the air in your home. In some cases, these spores can travel through your home's air ducts and spread when your AC or furnace runs. To know for sure, schedule a mold inspection to understand the severity of the problem. From there, mold remediation should be your top priority.

2. Sulfur/Rotten Eggs

Sulfur smells bad even on the best day, but smelling it indoors can feel overwhelming. That’s especially true if you know that natural gas smells like sulfur and rotten eggs. Unless you have rotten eggs in your kitchen, the smell should indicate a gas leak in your house.  

A whistling or hissing sound often accompanies the rotten egg odor, and you’ll hear it near gas appliances. You must immediately evacuate your home if you discover a gas leak. Call 9/11, then contact your gas supplier and wait outside your home until help arrives.  

3. Stale Air

Stale odors are hard to describe, but most people are familiar with them. That’s especially true for people who don’t keep up with regular HVAC maintenance. An HVAC system includes a large air duct system that gets clogged with dust and debris. Your house can smell stale if you don’t replace your air filters frequently enough. This smell is mostly unavoidable, unless you replace your air filter every few months.

HVAC technicians recommend replacing your filter every 30-90 days, but 30 days is too soon for some people. That said, you should at least check your air filter once per month to see how dirty it is. Keep a few extra air filters in stock at home to ensure you can quickly replace a dirty one as needed. It’s also important to schedule an air duct cleaning once every 3 to 5 years to prevent stale odors.

4. Chemicals/Glue

It’s hard to get comfortable when your house smells like strong chemicals and glue. However, these weird house smells typically go hand-in-hand with home additions and household work, like replacing the carpet. If you recently replaced your carpet or painted the walls, you’re likely smelling volatile organic compounds (VOCs). VOCs like formaldehyde, benzene, and toluene are commonly found in adhesives, paint, dyes, and lubricants.

You won’t smell VOCs at home unless you or someone else introduced products and supplies containing them. However, the smell can linger for a while, and it’s hard to get used to. Many building materials contain VOCs, which is why you may notice weird smells days or weeks after remodeling your kitchen. While VOCs aren’t good for you, especially if you have asthma, you'll at least know what caused the smell.

5. Sewage

It’s hard to mistake sewage odors for anything else, but you may wonder why the smell is in your home. Your first instinct may be to assume that there’s a sewage backup, but it may be something as simple as a dry p-trap. The p-traps beneath your sinks are meant to keep sewer gases away, but that can’t happen when the traps dry out. A P-trap typically dries out after a long period of disuse, as running the faucet is supposed to refill the water in the pipe.

You may also notice sewage odors if your drains are clogged, backing up sewer gases. In that case, manually unclog the drain or pour vinegar, baking soda, and hot water down it. Unfortunately, your house will also smell like sewage if your pipes crack and start leaking. This requires immediate attention, or the problem will worsen, making living in your home uncomfortable and unsanitary.

6. Fishy

“Fishy” isn’t a pleasant smell, but it may not make you think an emergency is happening. However, it may be one depending on the source, such as electrical problems or a refrigerant leak in your air conditioner. For example, you may notice a fishy smell if electrical outlets or wires overheat. That’s because the insulation around some wires can release this kind of smell when they overheat. It's a sign the wiring is melting, and you must turn off the power at the breaker right away.

If you also smell smoke, you must call the fire department and vacate your home. You can tell the smell is due to a refrigerant leak if your AC produces warm air despite being set to cool. This smell can also appear if your refrigerator’s coolant lines are leaking.

7. Rancid Meat

Only one thing can smell like rancid meat in your home: a dead animal. While it’s sad, animals can get trapped behind walls, in attics, and in air ducts. Once this happens, they may struggle to get out and can eventually die. You can tell the animal is in your air ducts if the odor becomes stronger when your furnace or AC is on.

If it’s somewhere else, the smell should be localized to that area. There’s also a good chance that you’ll notice bugs in the area. Removing a dead animal is unsafe if you have no protective equipment or experience. Instead, call a wildlife removal service or pest control company. However, you may need to contact an HVAC service if the animal is deep within your home’s ductwork.

8. Ammonia

Ammonia is another odor that indicates pests are present, but in this case, they’re likely alive. In many cases, you can tell your home has mice or rats due to the ammonia smell. This smell comes from their urine, and it can grow stronger as the infestation worsens. You will likely also hear movement in the walls or ceiling if an animal is in your house. Such pests often become more active at night, and the ammonia smell will worsen the longer they stay there. Call a pest control service or wildlife removal service to set traps.

Summing It Up

Strange household smells, like sewer odors, can indicate a sewage leak or a dry p-trap beneath your sink. Musty odors typically point to mold and mildew growing in the house, while ammonia odors can indicate pests. Vacate your home right away if you smell sulfur and rotten eggs, as these smells are signs of a natural gas leak.

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