What Should the Humidity Level Be in My Home? Tips and Guidelines

Is 65% Humidity Too High? Ideal Humidity Levels for Your Home 

Maintaining your home’s humidity level is crucial for your comfort and overall well-being — it can impact your health, the condition of your property, and even energy efficiency. If you’ve noticed your thermostat or a hygrometer reading around 65% and are wondering whether that’s a problem, the short answer is: it’s on the high end, but here’s exactly what that means and what to do about it. 

Understanding Humidity Levels 

Humidity is the amount of moisture present in the air, typically measured as a percentage — higher percentages mean more moisture. The ideal indoor humidity level can vary based on climate, personal preference, and the time of year, but there are general guidelines every homeowner can use. 

The Healthiest Humidity Level for Your Home 

The Environmental Protection Agency (EPA) recommends maintaining indoor humidity between 30% and 50% for optimal comfort and health. Here’s why this range matters: 

1. Comfort — around 30–50% humidity creates a comfortable indoor environment and helps prevent dry skin, irritated eyes, and respiratory issues. 
2. Energy efficiency — overly humid air feels warmer than it is, making your HVAC system work harder to cool your home; overly dry air can push you to turn up the heat, increasing energy use. 
3. Mold prevention — mold thrives in damp environments, so keeping humidity within the recommended range helps prevent growth on walls, ceilings, and other surfaces. 

Is 65% Humidity Too High in a House? 

While 65% humidity isn’t extreme, it’s well above the EPA’s recommended range. At this level you may notice a clammy or muggy feeling in the air, and the risk of mold growth starts to climb. A dehumidifier — or a properly sized HVAC system with humidity control — can bring that number back down to the 30–50% comfort zone. 

Common Humidity Questions by the Numbers 

1. 30–50% — the EPA-recommended range for comfort, energy efficiency, and mold prevention. 
2. 50% — not considered high; squarely within the recommended range for a comfortable, healthy home. 
3. 60%+ — the point where mold can start to grow; time to address ventilation or dehumidification. 
4. 65% — on the upper end of acceptable; mild discomfort and rising mold risk, worth correcting with a dehumidifier. 
5. 70% and above — high; take action soon with dehumidification, ventilation, or an HVAC humidity-control upgrade. 

How to Lower High Humidity in Your Home 

1. Run a dehumidifier — sized to your square footage, either portable or whole-home, to bring humidity back into the 30–50% range. 
2. Improve ventilation — use exhaust fans in bathrooms and kitchens, and make sure they vent outside rather than into an attic or crawlspace. 
3. Check your HVAC system — an oversized or poorly maintained system can struggle to remove moisture from the air even while cooling; a professional tune-up or a system with better humidity control can help. 
4. Fix moisture sources — address any leaks, damp crawlspaces, or standing water that add moisture to your home’s air. 

Frequently Asked Questions 

Is 65% Humidity Too High in a House? 

Yes, on the high side. It’s above the EPA’s recommended 30–50% range, which can bring mild discomfort and an increased risk of mold. A dehumidifier or HVAC humidity control typically brings it back into range. 

Is 64% Humidity High? 

It’s essentially the same story as 65% — on the upper edge of acceptable, with rising mold risk the longer it stays there. It’s worth monitoring and correcting rather than ignoring. 

What Humidity Level Does Mold Start to Grow? 

Mold can start to grow when indoor humidity exceeds 60%. At that point, reducing humidity and improving ventilation in moisture-prone areas like bathrooms and kitchens becomes a priority. 

Is 50% Humidity High in a House? 

No. 50% humidity is not considered high — it falls within the recommended range and should provide a comfortable, healthy living environment with minimal mold risk. 

What Does the EPA Recommend for Indoor Humidity? 

The EPA recommends keeping indoor relative humidity between 30% and 50%. Staying in that range supports comfort, energy efficiency, and mold prevention; venturing above 60% is where mold risk starts to climb meaningfully. 

Keep Your Home’s Humidity in the Healthy Range 

Maintaining your home’s humidity between 30% and 50% protects your comfort, your energy bills, and your home itself. If your home consistently runs high — or you’re not sure what your HVAC system can realistically manage — a professional assessment can make the difference between guessing and knowing. 

Schedule a whole-home dehumidifier or HVAC humidity-control assessment with Golden Rule request service online.