Only run the humidifier when the furnace is on: If your ducts are in an unconditioned space (most people’s ducts are), running the humidifier while the ducts are cold increases your risk of mold growth.

Can you put a humidifier on a furnace that is in the attic?

For example, humidifiers cannot be installed in unconditioned areas (attics) because the water supplying the humidifier (and in the humidifier), could freeze and potentially cause a major leak.

What type of humidifier should only operate when the furnace is running?





Bypass humidifiers

Bypass humidifiers have a water panel. With no motors of their own, they rely on air from the furnace’s blower to pick up moisture as it passes over the water panel before circulating through the ductwork. They’re only active, therefore, when the furnace runs.

When should I turn on whole-house humidifier?

When Should You Turn On Humidifier? It’s advisable to turn on the humidifier in winter only when the outside temperatures reach a specific range. Aim to only use this appliance when the outdoor temperature is within -20 to 10 degrees Fahrenheit.

Can you install whole-house humidifier on cold air return?

Can my Bypass Flow Through Humidifier be installed on the air return? Yes. Though the ideal mounting location is on the warm air supply, sometimes it’s not possible due to space restrictions. Fortunately, Honeywell’s Bypass Flow Through Humidifiers can also be installed on the return air duct.

Do whole house humidifiers cause mold?





If not used properly, here are some issues a whole house humidifier can cause: Excessive moisture can causes mold growth. Moisture can accumulate within your ducts, causing mold to form and then be distributed throughout the air in your home.

Are humidifiers good for attics?

Any leak or malfunction in the pipes or humidifier could cause water to be released in the attic, damaging insulation, the ceiling below, and possibly ruining other areas of the house. I would definitely shut off the water and, if possible, have the water pipe and humidifier removed entirely from the attic.

When should I turn off my whole-house humidifier?

A central humidifier can be a very worthwhile investment, helping to improve the quality of the air in your home during the winter season. Once the weather begins to warm up, though, it is essential to turn off the humidifier in your home until the heating season starts up again in the fall.

Should a whole-house humidifier run all the time?

Do furnace humidifiers run all the time? Some humidifiers run only when the furnace is on, while others can work independently. It is safe to leave your unit running all the time, if you are at home and if it is necessary. However, make sure that you are not over-humidifying the house.

Does the furnace have to be on for the humidifier to work?



Once this evaporation takes place, the air travels through your ductwork system and into your home as usual. For clarity, your air handler or furnace still needs to be running. The fan in the humidifier isn’t enough to get the moisture to travel through your entire home.

Where should you place a whole-house humidifier?

With a whole house humidifier, choose the most central room in your home, which is usually the living area. The idea is to get the unit where it can distribute the most humidity into the largest areas of the house. Placing the unit near a cold air return will help distribute the humidified air more thoroughly.

Where should a whole-house humidifier be installed?

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Should humidifier be on return or supply?



Proper installation



One of the most common questions is where to mount it — on the return or supply side. For most types of humidifiers, it really doesn’t matter, notes Lewis. “The furnace has a negative pressure on the return air and a positive pressure on the warm air side.

Should a whole-house humidifier use hot or cold water?

The humidifier works better with hot water, so avoid connecting it to the cold water line.

Why is humidifier on return duct?

If the humidifier you are installing is not a bypass type unit, then it should be mounted on the supply because that is where the hot air is located and the hotter the air across the media pad the greater capacity of the unit.

How do you humidify a whole house?

The best way to maintain healthy humidity levels is with a whole-house humidifier, also known as a furnace humidifier. Unlike single-room or personal humidifiers which only add moisture to a small space, furnace humidifiers take care of your whole house and require less maintenance.

What should I set my AprilAire humidifier to in the winter?



Relative Humidity Guide



Aprilaire, like any other humidifier manufacturer, designs their humidifiers to maintain an indoor relative humidity of 35% at an indoor temperature of 70F, anytime the outdoor temperature is 20F or above.

Where should I put humidifier in winter?

A humidity level around 50% will cause damaging condensation on your home’s window sills and walls. When the temperature is between 0 and 10 degrees, you will be better served with a humidity level of 20%. At between 10 and 20 degrees outdoor temperature, change the setting to 25%.

How do you tell if your house is too dry?

When it’s dry in our homes, those who live there are much more likely to wake up feeling dry air cold symptoms. If you’re waking up in the mornings with a dry throat and nose, or if the dry air is causing difficulty breathing on regular occasions, it’s likely your home is too dry.

Why is the air so dry in my house in the winter?

Why Is Indoor Air So Dry in the Winter? Cold winter air does not hold the same amount of moisture as warm summer air. Plus, turning on the furnace and heating the air can cause it to become even drier. Inversely, dry air can feel colder causing homeowners to crank up the heat even further.

What should humidity be in house in winter?



between 30-40 percent

What is a Good Level of Indoor Humidity in Winter? When asking about the best humidity levels for the air inside your home this winter, you’ll want a relative humidity level between 30-40 percent.