They replenish the humidity in the air in a safe, water vapor form (no mist or droplets).
Proper humidity provides a more comfortable living environment at a lower temperature so you can turn down your thermostat for energy savings which will also lower your utility bills.
They eliminate air in your home that is too dry. This dry air can damage wood products like pianos, picture frames, and cabinetry. Dry air can also cause hardwood floors to shrink, gap, and crack. The right amount of moisture will protect your floors.
Dry indoor air can also cause static shock. As you walk across a carpet or slide off upholstered
furniture, a static charge builds up in your body and results in a sudden, uncomfortable "zap" of electricity when you touch a piece of metal or other conductor.
If the relative humidity is below 30%, the air passages in your nose and lower airways in the lungs can become dry and irritated. This can cause unnecessary nosebleeds. With people who are prone to asthma, low humidity levels can cause an asthma attack. Also, increasing the moisture can prevent your skin from becoming dry and cracked, especially if you wash your hands a lot.
In the winter, it is especially important to add moisture to the air, since dry winter air can drive down the relative humidity level in your home to as low as 15%, which is drier than the air in most deserts. Your comfort will increase and you will feel much warmer with humidity levels set between 35% to 40%.
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