What Humidity Should My House Be At? Ideal Indoor Levels

OK, so here’s a nitty-gritty topic that can really go unnoticed until you’re either sweat-soaked in sauna-level humidity, or feeling as dessicated as a mummy in a museum: What Humidity Should My House Be At? You’re crushing it in business, you’re likely optimizing every damn thing, so why are you letting the air in your own home become a silent killer of comfort — and maybe even of your home itself?

You are not going to leave money in the table, are you? Imbalanced humidity is more or less the same thing, just escalated to atmospherical levels. It can take a toll on your health, your comfort, and even your wallet with repairs on your home. We’re about to go in-depth about the perfect indoor humidity levels, why this is important, as well as how you can best adjust it. “We’re absolutely done with those wishy-washy articles that give you nothing.” We want to offer something actionable, and fact-driven, so you can optimize this neglected part of your life.

Why It Matters to You: The Controversy Surrounding the Moisture in Your Air

Let’s be straight about one thing: The air in your home does not just exist. It’s an environment, and you want to control the variables, like any environment. One big one is humidity — how much moisture there is in the air. Get it wrong, and you are asking for trouble.

Your Body’s Own Thermostat Can Only Do So Much

Consider those brutal summer days. It’s not just the heat; it’s that thick, sticky feeling. That’s a high humidity sabotaging your body’s cooling system. You sweat, right? That’s your body’s built-in air conditioner. But if the air is already full of moisture, your sweat can’t evaporate as well, and you just feel hotter and more miserable. It can even give you heat exhaustion.

Now reverse the picture and set it in winter. The air outside cools, and cold air cannot hold as much moisture. Crank up the heat inside, and that already parched air gets even drier. Ever wake up with a throat like sandpaper or skin that can crack a mirror? That’s low humidity punchin’ your body in the teeth. It can irritate your eyes and nasal passages, and some research suggests it might even make you more susceptible to viruses that float in the air, like the flu.

Bottom line: Too high or too low, humidity gone wild makes you less comfortable — and healthy. And you’re trying to perform at your best, right? You can’t when you feel like a raisin or a swamp thing.

Your House Has Feelings Too

You are likely careful with your investments and holdings. Well, your home is probably one of your largest. So don’t consider it; it’s like parking your Ferrari outside in the rain with no protection.

Excess humidity can cause condensation on windows (a major red flag!), which is a great environment for mold and mildew to thrive. Not only can that smell musty and unpleasant, but mold can damage your walls, ceilings and even furniture. And it is a major cause of allergies and asthma. Wood can warp and rot, paint can peel and you just may start noticing unwanted inhabitants like dust mites thriving in the soggy setting.

Not enough humidity does no good either. It will cause cracking and splitting on wood floors, furniture, and dare we say, your guitar collection. You may see paint starting to chip, static electricity building (a pesky build-up that can even shock your electronics).

Here’s one way to think of it: Proper humidity is to your home what a balanced diet is to your own body. It maintains everything so nothing breaks down that doesn’t have to.

The Sweet Spot: What’s the Best Humidity Range?

Fine, let’s get some ironing done, then. Let’s get to the solution. So, what humidity should my house be at?  The consensus among experts, supported by the likes of the EPA and ASHRAE, is that your home should hold between 30% and 50% relative humidity. Some sources also recommend a slightly wider comfort zone of 40% to 60%, but it might be smarter to err on the lower side to help prevent mold.

Here’s a quick breakdown:

• Optimal: 30% – 50% relative humidity for comfort, health and to prevent mold.
• Under 60%: You can prevent mold growth.
• Stay Above 30% to Avoid to avoid dry skin, respiratory issues and harm to your home.

The Seasons Change, So Should Your Humidity

Similar to how you adjust your thermostat, you may have to control your humidity levels by season.

You see, when it’s really cold outside in the winter, and you keep your house humid, and you still have really cold glass, you can get condensation on those windows. That moisture that it holds can also cause mold and ilf even structural damage. So, kind of make yourself smaller in the colder months.

Air conditioning tends to dry the air, rather than humidify it, and in the summer, the air may well be juiced up enough. You should be leaning on the lower spectrum of the range, to prevent that sticky feeling, and more importantly, to deter mold.

What About Specific Situations?

Though personal issues and quirks of your home may dictate some modification.

• If Someone in Your Home Has Asthma or Allergies: Try to keep it under 50% to reduce dust mites and mold, which can be irritants to the respiratory system.
• If You Have Many Pieces of Wood Furniture or Hardwood Floors: Steady humidity between 40 and 50 percent can help forestall the cracking and warping that comes with fluctuating dry air.
• For Better Sleep: Surprisingly a little higher, say 40 and 60 percent in the bedroom, if some research is to be believed, suggests a higher range, to stop dry air from messing with your beauty rest. Just make sure not to exceed 60% moisture and risk the growth of mold in your mattress.

Is Your Home’s Humidity Off? Here Are the Red Flags

Don’t just guess! And watch for the signals your house is providing.

Signs of Too-Low Humidity

• You feel like you licked a cactus: Dry skin, chapped lips, itchy eyes are classic symptoms.
• Your throat is scratchy: Sore throats, nosebleeds and a nagging cough are a few of the signs that the air is too dry.
• Revelations: Being shocked by static electricity all the time when you touch stuff.
• Wood splitting: Notice cracks in your wooden furniture or floors.
• Sick more often? Dry heat can also make you more susceptible to colds and respiratory infections.

Signs of Too-High Humidity

• Window woes: Condensation — water droplets — on the interior side of your windows.
• Fuzzy (and not in a good way): Any visible mold spots on walls, in corners or in the bathroom.
• SMELLS FISHY (OR MUSTY): A persistent musty smell in your home.
• Tossing and turning: Humidity may be linked to poor sleep quality.
• Feeling sticky? You’re standing in the damp, oppressive air.

If you’ve noticed any of the above, it’s time to do something about it and get your humidity levels in check.

Seizing Control: How to Attain Perfect Humidity

Okay, so you know the issue, you know the sweet spot, you know the red flag. Now, let’s talk solutions. You’re not the kind to sit around and whine, are you? You’re a problem-solver. So, this is your toolbox for humidity management.

Cranking Up the Moisture (When It’s Too Dry)

• Invest in a Humidifier: Consider these your workhorse devices for infusing the air with moisture. You’ve got tabletop versions for single rooms and whole-house systems that work in tandem with your HVAC. Especially useful in winter.
• Add Some Green: Houseplants expel moisture into the air via transpiration. Plus, they look good. It’s a win-win.
• Water Features: Consider placing indoor fountains, or simply bowls of water close to heat sources to help humidify as water evaporates.
• Steam It Out: Let steam linger by leaving the bathroom door open after a shower or by not covering pots immediately when you cook. That steam hydrates the air.

Suck Out the Excess (When It’s Too Humid)

• Purchase a Dehumidifier: While humidifiers add moisture, dehumidifiers help to take it out. “Portable units are a good option in damp areas like a basement, while a whole-house unit works throughout the house. The EPA suggests using them if your humidity remains at above 50 percent.
• Venting is Good: Turn on exhaust fans in the bathroom and kitchen while you’re showering or cooking to wisk away moist air. Open your windows when the weather is nice to let drier, fresh air in.
• Fix Those Leaks! Even small gaps around windows, doors and pipes can bring additional moisture inside your home. Get them fixed ASAP.
• Cool air and drier air are not the same: Not only will your AC unit be cooling the air, but it is also taking some of the moisture out of it. But make certain you have the correct size for your space; an oversized unit may cool too fast without dehumidifying enough, leaving you with that cold and clammy feeling.
• Take care of your HVAC system: Regular maintenance, and regular filter swaps every 60-90 days can keep your system running well and helping you manage humidity.

Know Your Numbers: Invest in a Hygrometer

You can’t control what you can’t measure. A hygrometer is a cheap instrument that takes the relative humidity of your home. Get one (or several) and strategically place them around so you have a more complete picture of how humid your place is. Some smart thermostats even have their own hygrometers.

Preventive Measures: What you can do to avoid humidity issues

Don’t be reactive to humidity problems; be proactive.

• Ventilation, Ventilation, Ventilation: Proper air flow is the single most important factor in avoiding moisture buildup. Think about a whole-house ventilation system that will circulate fresh air and exhaust stale, damp air.
• Insulation is Important: The right insulation is like a hat and coat for your home, with the added bonus of helping stop conditioned air (and its moisture) from leaking out. Seal any gaps and cracks.
• HVAC Checkups: Regular professional maintenance of the heating and cooling portion of your HVAC system ensures that it’s doing its job to control humidity efficiently.
• Air Sealing in Winter: Insulating keeps the heat inside where you paid for it, and in cold climates especially, sealing air leaks prevents that cold, dry outside air from rushing in and dropping your indoor humidity to uncomfortable levels.

Look, getting the humidity in your home dialed in isn’t rocket science, but it helps paint a complete picture of comfort and health. You manage your business, your money, and your fitness. Your indoor environment just got easier to manage.

So then, what humidity should my house be at? Aim for that sweet spot between 30 and 50 percent, adjust seasonally, watch for signs, and apply the correct measures to maintain your home as a comfortable, healthy and well-kept refuge. Now go out and make your air your friend, not your enemy.

Questions and Answers (Q&As)

What is the ideal humidity level for one’s home?

The best humidity for home ranges between 30% and 50% relative humidity. This range can inhibit the growth of mold, as well as the spread of other allergens like dust mites, and disease, which can be problems with both dry and too-humid air.

Can mold grow at 55% humidity?

Molds are not as likely to grow at a constant level of 55 percent humidity as they are above 60 percent. Nevertheless, mold will still be able to grow at humidity levels from 50% to 60% if contributing factors such as temperature and the presence of organic materials are favorable. It’s usually best to try and maintain a humidity of less than 60% to reduce the risk of mold.

Is 65% humidity too high for a house?

Yup, 65% humidity is way too high for a house. Humidity over 60 percent also can create an environment in which mold, mildew, and dust mites can flourish, triggering allergies or asthma. High humidity also can make the air feel uncomfortable and harm your home. The optimum range is 30 to 50%.