A Smell in Your House
You Can't Quite Identify?
Musty, chemical, sewage, or just something that shouldn't be there. Before calling a mold company or buying anything, find out what it actually is first.
Start Free Assessment (16 Minutes)If the smell is sudden, strong, or causing symptoms right now: A sulfur or rotten egg smell could be a gas leak. A sharp burning smell could be electrical. Strong chemical fumes causing dizziness need immediate response. Evacuate and call 911 or your gas company. This assessment is for investigating persistent, ongoing smells, not acute emergencies.
Does This Describe What You're Dealing With?
- A musty, earthy smell that seems to come from the basement, a specific room, or the HVAC vents
- A chemical or sweet smell that started after new furniture, flooring, or a renovation
- A sewage or rotten egg smell that comes and goes and you can't find the source
- A burning or metallic smell with no obvious cause you can point to
- The smell gets worse after rain, in humid weather, or when the heat or AC kicks on
- Other people notice it when they come over, so you know it's real
- You've tried opening windows or using air fresheners but the smell comes back
- You're worried it might be mold, but you haven't seen any
👃 "Unpleasant or unusual odors"
The assessment will investigate the smell characteristics, location, and timing patterns most useful for identifying your source category.
Why Identifying the Source Matters More Than Treating the Smell
Different smells mean different problems and need completely different responses. Treating the wrong one wastes money and leaves the actual source unaddressed, often getting worse.
🍂 Musty or Earthy Smell
Points to moisture accumulation and mold growth somewhere in the structure. Could be visible surface mildew, but the more common scenario is moisture behind walls, under flooring, or in HVAC components. Air fresheners and purifiers won't fix a moisture source.
🧪 Chemical or Sweet Smell
New furniture, flooring, cabinets, and paint all off-gas volatile organic compounds for months. Nail polish-like or sweet chemical odors that appeared after a purchase or renovation are typically this. Ventilation and time help. Air purifiers with activated carbon help somewhat. The source eventually clears on its own.
🚿 Sewage or Drain Smell
Comes and goes, often stronger in bathrooms or near floor drains. The most common culprit is a dry drain trap: a p-trap that's lost its water seal and is letting sewer gas back in. This is a $0-$20 fix. Many people call a plumber and pay hundreds before discovering this.
⚡ Burning, Metallic, or Fishy Smell
A fishy smell when nobody's cooked fish often comes from overheating electrical components, particularly plastic insulation on wires. This needs professional electrical evaluation, not air quality products. It's one of the clearer cases where acting on the wrong diagnosis creates a real hazard.
A common and expensive mistake: Someone smells something musty and immediately calls a mold remediation company. The company finds some mold and quotes $2,000-$4,000 for remediation. What they don't always investigate first: whether a dry drain trap or plumbing vent issue is the actual source of a sewer gas smell misidentified as "musty." The mold may be real, but it may also not be the source of the smell.
Knowing the smell characteristics before calling anyone changes the conversation and often the outcome.
Three Things to Notice Before You Start
These take a few minutes and make the assessment considerably more useful.
Where Is It Strongest?
Walk through your home and try to identify where the smell is most concentrated. Basement or crawl space points toward moisture and mold. Near drains or toilets points toward plumbing. Near HVAC vents suggests the system is distributing something. In a specific room with new furniture or recent renovation points toward off-gassing. "Everywhere" suggests the HVAC is spreading it from a central source.
When Does It Get Worse?
After rain or humid weather points toward water intrusion or mold responding to moisture. When heat or AC runs suggests the system is involved. After you shower or use water fixtures points toward drain traps or ventilation. Constant and unchanging suggests a persistent source that isn't weather-dependent. Comes and goes without pattern may indicate an intermittent source like a drain trap that periodically dries out.
When Did It Start?
Can you connect it to a specific event? A new piece of furniture, flooring, or a renovation strongly suggests off-gassing. A water event like a leak, flooding, or roof problem followed weeks later by a musty smell is a classic mold development pattern. If it's always been there or developed gradually with no clear event, that points toward chronic moisture or ventilation issues that have been building.
Worth knowing: Some odors indicate ongoing damage even when they don't feel like emergencies. A musty smell means moisture is present and mold is growing somewhere. A sewage smell means gas is entering the living space. Acting sooner matters even when the situation isn't dangerous in the moment.
What the Assessment Investigates
The assessment works through what the smell reminds you of, where it's strongest, when it appears, whether you've had water events, your home's moisture indicators, and recent changes. Results are ready immediately when you finish.
Output comes in three categories: source investigation steps you can do without spending anything, product guidance only when your smell pattern warrants it, and direction on which professional to contact when the situation calls for one.
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Select "Unpleasant or unusual odors" to begin
Why EezyAir
Source First, Solutions Second
We identify the probable source category before suggesting any action. A sewage smell and a musty smell need completely different responses. Getting this wrong is expensive.
Nothing to Remediate or Sell
Mold companies make money on remediation. HVAC companies make money on system work. We have no service to upsell you toward. The assessment points toward what your situation actually calls for.
Safety Issues Get Flagged
Some smells indicate situations that need professional attention quickly. We identify those patterns and direct you to the right type of help rather than treating everything the same.
Optional upgrade: After your free assessment, you can choose to have a U.S.-based analyst review your photos of concerning areas, answer specific questions about your smell patterns, and confirm your next steps. Under $150. Start free. Upgrade only if you want it.
Find Out What That Smell Actually Is
16 minutes. Instant results. Free to start.
Begin Free AssessmentSelect "Unpleasant or unusual odors" to get started · No credit card · 3,562 completed