Anything above 50% relative humidity indoors is generally considered high, and most comfort experts recommend keeping your home between 30-50%.
Humidity is just a fancy word for how much moisture is floating around in the air. A little moisture keeps your skin and sinuses happy. Too much, though, and you’ve got a recipe for discomfort, mold, and possible damage to your home.
In this guide, we’ll break down exactly what humidity is considered high, what causes it, and how you can get your home back to a comfortable, healthy level.
What Humidity Level Is Considered High?
Relative humidity measures how much moisture is in the air compared to how much it could hold at that temperature. The higher the percentage, the stickier the air feels. Here’s a quick breakdown:
- Below 30%: Too dry; it can cause dry skin, irritated sinuses, and static electricity
- 30-50%: The sweet spot for comfort and health
- Above 50%: Considered high and starts to feel uncomfortable
- Above 60%: Creates ideal conditions for mold and mildew growth
The short answer to what humidity is considered high is anything consistently above 50%.
What Happens When Indoor Humidity Is Too High?
High humidity doesn’t just make your home feel uncomfortable; it can also cause real problems if it sticks around too long, including the following:
- Increased stuffiness and discomfort
- Mold and mildew growth
- Musty odors throughout the house
- Damage to furniture, flooring, and other belongings
- Extra strain on your HVAC system, which has to work harder
What Causes High Humidity in a Home?
Here’s what typically drives humidity levels up.
Outdoor Humidity
When it’s humid outside, that moisture can seep indoors through doors, windows, and your home’s structure.
Poor Ventilation
Without proper airflow, moisture from everyday activities has nowhere to go and builds up over time.
HVAC Issues
An oversized or poorly maintained HVAC system won’t remove moisture effectively, even if it’s cooling your home just fine.
Cooking and Showering
Everyday tasks like boiling pasta or taking a hot shower release a surprising amount of moisture into the air.
Air Leaks and Moisture Intrusion
Gaps around windows, doors, or your foundation can let outside moisture sneak right in.
How to Tell if Your Home Has High Humidity
Some signs are easy to spot: foggy windows, a clammy feeling in the air, or that musty basement smell. You might also notice peeling paint or warped wood.
The most reliable way to know for sure what humidity is considered high for your home is to use a hygrometer, a small, inexpensive tool that measures indoor humidity. If your readings stay above 50% regularly, it’s worth calling in a professional for a more detailed inspection.
How to Lower Humidity in Your Home
The good news? High humidity is fixable. Here are a few ways to bring those levels back down:
- Use your HVAC system effectively, especially during humid months
- Improve ventilation throughout your home
- Run exhaust fans in kitchens and bathrooms
- Consider adding a dehumidifier
- Fix leaks and other sources of excess moisture
Humidity Control Solutions for Your Home
Depending on your home’s needs, you might benefit from a whole-home dehumidifier integrated with your HVAC system, or a portable unit for smaller spaces.
Want a deeper dive into your options? Check out Your Guide to Humidity Control Solutions for more detail on what might work best for your home.
When to Call an HVAC Professional
Sometimes humidity issues go beyond a quick fix. If you’re noticing any of the following, it’s time to call in a professional.
- Persistent high humidity that won’t budge
- Trouble maintaining comfortable indoor levels
- Visible signs of moisture or mold
- An HVAC system that seems to be struggling
Help Your Home’s Humidity Find the Right Balance
Now that you know what humidity is considered high and what to do about it, you don’t have to deal with it alone. Our team at Triad Mechanical has spent over 30 years helping homeowners across Loganville, Lawrenceville, and Panama City Beach stay comfortable year-round.
Whether you need a quick HVAC tune-up or a full humidity control system, we’re here to help you figure out the best fix for your home. Give us a call, and we’ll get your air feeling just right again.