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A humidifier for a furnace, otherwise known as a whole house humidifier, connects to the HVAC system to deliver moistened air throughout the house. There are several types of furnace humidifiers. A flow-through humidifier for furnaces uses freshwater that flows through the system and drains away. A reservoir type has a reservoir of water that moistens a rotating drum. And a steam humidifier heats water to create steam that is injected into the furnace airflow.

Of the three types of furnace humidifiers, the flow-through is often considered the best humidifier for furnaces. That's because it is more reliable, more hygienic and requires much less maintenance than reservoir types.

A flow-through humidifier typically is mounted to the furnace's cold-air return duct and connects to the hot-air supply of the furnace through a humidifier supply takeoff duct. The takeoff duct diverts some heated air into the humidifier, where it absorbs moisture from an evaporator pad before returning to the warm air stream through the cold-air return duct and furnace. However, some flow-through humidifiers are mounted directly to the hot air supply duct and do not use a supply takeoff duct.

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How do humidifiers help?

Humidifiers add moisture to the air. They can help people with dry skin, allergies, and respiratory problems. They may also help prevent influenza and reduce snoring, among other benefits.

Five humidifier uses and their benefits

1-Preventing influenza

Researchers found that humidity levels above 40 percent rapidly deactivated virus particles, making them much less likely to be infectious.

2-Making a cough more productive

Dry air can cause a person to have a dry, unproductive cough. Adding humidity to the air can get more moisture into the airways, which can make a cough more productive. A productive cough releases trapped or sticky phlegm. 

3-Reducing snoring

Increasing the amount of moisture in the air can also reduce snoring. If the air is dry, a person’s airways are less likely to be sufficiently lubricated, which can make snoring worse.

4-Keeping the skin and hair moist

Some people notice that their skin, lips, and hair become dry and fragile in the winter.

Many types of heating units pump hot, dry air through the house or office, which can make the skin dry, itchy, or flaky. Cold air outside can also dry out the skin.

Using a humidifier to add moisture to the indoor air may help to reduce the occurrence of dry, cracked skin.

5-Benefits for the home

Moisture from a humidifier can be helpful around the home. Any moisture-loving houseplants may become more vibrant, and wood floors or furniture may last longer. Humidity can also help to prevent wallpaper from cracking and static electricity from building up.

Some people experience respiratory symptoms in the summer months, when the weather is hot, and the air contains more allergens. Air conditioners and fans can circulate dry air through the room, and air conditioners remove any moisture from the air. A humidifier may be beneficial during this season.

However, people are more likely to benefit from a humidifier in the cold months, when cold air dries out the lungs, nose, and lips. Also, some types of central heating can dry out the air indoors.

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Humidifier Info

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