The short answer
Where the Smell Comes From
Musty odors are almost always a sign of mold or mildew growth somewhere in your home. Mold spores are everywhere, but they only start to grow when moisture is present. In summer, high outdoor humidity can push damp air into your house, especially through crawl spaces, basements, and poorly sealed windows.
When that humid air meets a cooler surface, like a concrete floor or an air conditioning vent, condensation forms. The damp spot becomes a perfect home for mold. Even a small amount of hidden moisture, such as a slow pipe leak behind a wall, can create a persistent musty smell that gets stronger as temperatures rise.
Common Summer Moisture Sources
Check the usual places first. A leaky pipe under a sink, a worn roof flashing, or a clogged gutter can let water seep into walls and floors. Air conditioning units that drain poorly can also leave water sitting in drip pans or ducts, which turns musty quickly in warm weather.
Humidity alone can be the culprit. If your home has no air conditioning, or you keep windows open on humid days, indoor humidity levels climb. Moisture can also rise from the ground through a concrete slab or crawl space, especially if there is no vapor barrier. Identifying the source is the first step to stopping the smell.
- Check under sinks and around toilets for slow drips
- Inspect the attic for roof leaks or poor ventilation
- Look at window seals and door frames for gaps
- Clean air conditioner filters and drain pans
- Feel walls and floors for damp spots or staining
- Use a moisture meter in suspicious areas if you have one
Why Summer Makes It Worse
Warm air holds more moisture than cool air, so summer humidity levels are naturally higher. When that humid air enters a cooler, air-conditioned home, it can condense on cold surfaces. Basements and crawl spaces are especially prone because they stay cooler than the rest of the house.
The heat also speeds up mold growth. Mold thrives in temperatures between 60 and 80 degrees Fahrenheit, which is common in many homes during summer. With moisture and warmth present, mold colonies can expand quickly, making the musty smell stronger and harder to ignore.
What You Can Do Yourself
Start by reducing indoor humidity. Use exhaust fans in bathrooms and kitchens, and run a dehumidifier in damp areas like basements. Keep windows closed on humid days and make sure your air conditioning system is draining properly. Fix any small leaks you find right away.
For visible mold on hard surfaces, clean with a mild detergent and water. Dry the area completely afterward. If the mold is on drywall or insulation, you may need to remove and replace those materials. Always wear gloves and a mask when cleaning mold to avoid breathing in spores.
- Run a dehumidifier in basements or crawl spaces
- Use exhaust fans after showers and cooking
- Keep interior doors open to improve air flow
- Wipe down condensation on windows and pipes
- Fix leaky faucets and toilets promptly
- Dry wet laundry outside or in a vented dryer
When to Call the Pros
If you cannot find the moisture source, or if the smell persists after your own efforts, it may be time to bring in local water damage pros. They have tools like moisture meters and thermal cameras to locate hidden dampness behind walls and under floors. A thorough inspection can reveal problems you cannot see.
If water damage is significant, the pros can extract standing water, dry out structural materials, and remove affected drywall or flooring. They can also set up industrial dehumidifiers to dry the space thoroughly. If you live in Rogers, keep your shutoff valve location written down so you can stop a leak quickly if one happens.
Policies vary, and your insurer decides what is covered. Check your policy to see if water damage from a specific cause is included. Your insurance company can tell you what steps to take if you plan to file a claim.
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Call Now (479) 370-1500Frequently asked questions
Is a musty smell dangerous?
Musty odors themselves are not toxic, but the mold behind them can cause allergy symptoms like sneezing or itchy eyes. Some molds produce allergens that affect breathing. If you feel unwell, see a doctor. Removing the moisture source is the right way to protect your health.
Can I just use air freshener to mask the smell?
Air fresheners only cover the odor temporarily. They do not remove the mold or the moisture feeding it. The smell will return, and the mold can continue to spread. Find and fix the moisture problem first, then clean the affected area thoroughly.
How long does it take to get rid of a musty smell?
It depends on the source and how much moisture is present. Small issues, like a leaky pipe, can be fixed in a day, and the smell may fade within a week. Larger problems, like a flooded basement, can take longer to dry and may need professional help. Patience is key.