How Much Does a Whole-House Humidifier Cost? [2025 Data]

A whole-house humidifier costs $578 on average, but you can expect to pay between $392 and $765 depending on the size and type of unit, as well as labor rates. That said, smaller budget models might be as low as $175, while high-end models that attach to your furnace could reach $1,350. Let’s review the cost breakdown of purchasing and installing a whole-house humidifier.

Whole-House Humidifier Cost Factors

The cost of a whole-home humidifier will ultimately depend on factors such as type of humidifier, unit size, and more. 

Type of Humidifier 

There are three main models of whole-house humidifiers: drum (bypass), flow-through, and steam-powered.

Drum Humidifier Cost

Drum humidifiers are the most affordable option, ranging between $100 and $300, but they need a lot of maintenance to ward off mold. These work by drawing water from a reservoir onto a rotating wheel (or drum). As the wheel turns, the water evaporates and is circulated as warm, moist air.

Drum humidifiers can be bypass (relying on your furnace blower) or fan-powered (relying on an internal blower). Bypass models cost less because they don’t need an independent motor, though they require more maintenance, and they’re best for smaller spaces. 

Flow-Through Humidifier Cost

Flow-through humidifiers are moderately priced options, often ranging between $200 and $600, plus the cost of installation. These humidifiers work with a pad that’s saturated with water. When air from the furnace blows over the pad, the water is evaporated and circulated through the house. Flow-through humidifiers can also be bypass or fan-powered. 

Steam Humidifier Cost

As the most expensive option, steam humidifiers range from $300 to $1,100. Installation raises the price further. Steam humidifiers work by heating water in a reservoir, which is then released in the ductwork as steam. These humidifiers are effective and low-maintenance, and they have a decreased risk of mold. 

Size of Unit

Larger homes have a greater air volume, so they’ll need a humidifier with higher capacity (measured in gallons per day) to raise moisture levels. A well-sealed 1,500-square-foot home requires about 3.2 gallons of water per day, while larger homes may need twice this amount. As expected, humidifiers with larger capacities are more powerful, so they cost more. 

Add-Ons

You should also consider potential add-ons for your furnace humidifier cost.

• Hygrometer: This humidity gauge ensures the unit is pumping the right amount of moisture into your home, and it costs $10 to $70 on average. 

• Humidistats: These devices check humidity levels, and they also adjust them automatically. Expect to pay $30 to $150 for a humidistat if your humidifier doesn’t already have one.

• Evaporative pads: These are used with drum and flow-through humidifiers. You should replace them at least once per year, which will often cost between $10 and $50. 

Whole-House Humidifier Installation Costs

If you hire an HVAC professional to install your whole-house humidifier, you’ll need to pay for labor. Some professionals also charge a service fee. 

Labor

You can expect to pay anywhere from $100 to $1,000 in labor to install your whole-house humidifier. Some HVAC professionals charge an hourly fee, which ranges from $50 to $150 per hour, depending on the complexity of the job. 

Labor costs will vary depending on several factors, including the type of pro, the type and size of humidifier, and the time of year. Installation location also matters, since difficult-to-reach spaces (like closets or attics) might add to your labor cost.  

Contact a local humidifier installer to get a customized estimate for your home project.

Service Fee

Some HVAC professionals charge a service fee on top of installation costs, and the average HVAC service fee is between $100 and $200. This price might be well worth it if a consultation is included. This way, a professional can tell you which model and size will save you money on energy costs.

Additional Costs to Consider

When calculating the costs of a whole-house humidifier, you should also consider long-term expenses like maintenance and repairs.

Maintenance

Whole-house humidifier maintenance can keep your system running properly. If you get an annual maintenance check, expect to pay around $75 to $200.

Mold remediations costs are also possible—usually around $200–$600 for testing and $400+ for duct cleaning. Keep in mind that regular humidifier maintenance decreases the risk of mold growth in the first place.

Repairs

The national average cost to repair a humidifier is around $230. Some units, especially those that run through your ductwork and add moisture to your whole home, could cost as much as $500 to repair. Labor fees in your region, the extent of repairs, and the type of unit will play a role in the final price. 

Energy Costs

The cost of running a whole-house humidifier varies based on type.

DIY Humidifier Installation vs. Hiring a Pro

HVAC professionals charge $50 to $150 per hour (along with a service fee), and installing a whole-house humidifier can take up to five hours to complete, so you might save as much as $400 with a DIY job.

That said, installing a whole-house humidifier isn't a project to be taken lightly. Experience with plumbing, HVAC, and electrical are all necessary. Because your humidifier attaches to your home's HVAC system, an error could lead to costly repairs or injuries. Systems that aren't installed properly could force your humidifier and furnace to work harder, which will drive up your energy bill, too.

To ensure a safe and efficient installation, contact a humidifier installation professional near you to get started.

How to Save on Whole-House Humidifier Costs

While adding a whole-house humidifier brings a host of benefits, installation and maintenance costs can quickly add up. Consider some budget-friendly ways to cut down on whole-house humidifier costs.

• Schedule your installation during the off-season when labor prices are lower and appointments are available. 

• Opt for a smaller-sized unit, as larger humidifiers tend to cost more.  

• Choose an economical yet quality brand of humidifier. 

• Obtain at least three quotes before hiring an HVAC professional to ensure the best value for your budget. 

• Keep up with regular humidifier maintenance to decrease the chances of costly repairs.

How Angi Gets Its Cost Data

Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We survey real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects. 

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