Yes, 70 % is considered high for indoor humidity. The ideal range for a comfortable, healthy home is between 30 % and 50 %, and anything above 60 % risks causing structural or health issues.
Humidity can also come up through the soil, especially if your house is near a lake or river. And excess moisture from cooking, bathrooms, appliances, and showers can also raise the moisture levels in your home.
Health. Optimal indoor humidity for health between 40% and 60% can help reduce the risk of respiratory infections, allergic reactions and skin irritation. High humidity above 60% can make the air difficult to breathe while low humidity can cause dry skin, itchy eyes and a sore throat.
The ideal indoor humidity for dry sinuses is between 30% and 50%. This range adds enough moisture to relieve nasal irritation and thin out mucus without creating a damp environment where mold, bacteria, and dust mites thrive.
To ensure the removal of indoor pollutants and the supply of fresh outdoor air, an HRV should be operated on low speed continuously year-round, especially in airtight homes and homes with normal indoor pollutant levels.
Avoid using a humidifier when your indoor relative humidity exceeds 50%, if you are running the device with dirty water, or if a household member has active asthma or mold allergies. Excessive moisture leads to mold growth and dust mites.
A persistent dry nose, often accompanied by crusting or frequent nosebleeds, is primarily linked to a vitamin A deficiency. Vitamin A is crucial for the growth, repair, and moisture regulation of the mucous membranes that line your nasal passages.
Sleeping with a humidifier every night is generally not bad and can actually improve your skin, sinuses, and sleep quality. However, doing so incorrectly can introduce issues like mold growth, bacteria, or breathing difficulties.
Sinus infections are primarily caused by viruses and usually resolve on their own. The fastest way to "kill" the infection naturally is to boost your immune system and flush out the trapped mucus using targeted remedies:
At 70% humidity, the air feels heavy, sticky, and oppressive. Because moisture prevents sweat from evaporating efficiently, your body struggles to cool itself. Outdoors on a warm day, the heat index can make the temperature feel up to 10 to 15 degrees hotter than it actually is.
Gray Mold (Botrytis)
Botrytis is one of the most widespread humidity related problems. There are Over 200 species of the botrytis fungi that cause gray mold.
High humidity over 60% can encourage mold and mildew, and damage furniture, wallpaper, paintwork, floors, and brickwork. To help combat high humidity problems, heat your home properly, use ventilation, and keep moisture-creating activities to a minimum.
Signs of High Humidity
Condensation on Windows: If you notice water droplets on the inside of your windows, it's a sign that there's too much moisture in the air. Mold Spots: Mold loves damp environments. If you're spotting mold in corners, on walls, or in the bathroom, your home's humidity is too high.
Initial drying: When using a dehumidifier in a damp space for the first time, run it continuously for 24 to 48 hours on a low humidity setting (around 30%) to thoroughly dry the area. Regular use: To maintain a comfortable humidity level (30–50%), running the dehumidifier for 8 to 12 hours per day is often sufficient.
If indoor humidity exceeds 50–60%, it creates an ideal breeding ground for mold, mildew, and dust mites. This excess moisture can trigger allergies and asthma flare-ups, cause wood rot, peel wallpaper, and leave the house feeling sticky, musty, and uncomfortable.
Run your humidifier for 8 to 12 hours a day, or only as long as it takes to maintain an ideal indoor humidity between 30% and 50%. Continuous operation without a monitor can cause mold and mildew.
Humidifier sickness—often caused by inhaling bacteria, mold, or mineral dust from a poorly maintained device—typically triggers respiratory and flu-like symptoms. You may experience coughing, chest tightness, nasal congestion, fever, chills, headaches, and muscle aches. These symptoms often worsen indoors and improve when you leave the space.
Yes, you can use tap water in your humidifier, but manufacturers generally recommend using distilled water. Tap water is safe, but it contains dissolved minerals (like calcium and magnesium) that can build up inside your machine as limescale, reducing its efficiency and lifespan.
When your vitamin B12 is low, you most commonly crave meat, fish, and eggs. Because your body is trying to self-correct, it instinctively signals a desire for nutrient-dense animal products that naturally contain the highest amounts of B12.
Vitamin D deficiency occurs when your body doesn’t get enough of this vital nutrient, which is essential for bone health, muscle function, and immune response. Because its initial symptoms are typically vague or easily mistaken for everyday stress, it often goes unnoticed for years.
Vitamins don't directly decongest your nose like a nasal spray, but they can reduce the underlying inflammation and speed recovery. The most effective options target the immune system and allergy responses.
Truthfully, there's never a bad time to use a humidifier in your home. However, when the temperature drops, the moisture levels in the air also drop far below ideal levels. Maintaining an indoor humidity level of 40% to 60% is ideal for comfort and reducing some of the health effects of overly dry air.
You need a humidifier if the relative humidity in your home drops below 30%. Common signs include waking up with a sore throat or dry nasal passages, frequent static electricity shocks, constantly chapped lips, or wooden furniture beginning to crack.
Humidifiers are safe for cats, and plain water mist can actually benefit them by easing respiratory issues and soothing dry skin. However, you must avoid warm-mist units, as these pose a serious burn hazard, and you should never use essential oils or additives, which are highly toxic to cats.