Whole home dehumidifiers typically cost between $1,500 and $3,500 installed, depending on the unit's capacity, your home's size, and whether you need ductwork modifications.

A whole home dehumidifier is a single system that connects to your HVAC and removes moisture from your entire house at once, rather than sitting in one room. The price breaks into two parts: the unit itself and the installation labor. The unit alone runs $800 to $2,500. Installation—including ductwork assessment, any necessary modifications, and connection to your existing system—adds $700 to $1,500 more.

The final cost depends on what you already have. If your home has a forced-air furnace or air conditioning system with existing ductwork, installation is simpler and cheaper. If you have a heat pump, radiant heating, or no ducts at all, the contractor may need to install new ductwork or use a standalone unit instead, which raises the price significantly.

Key Takeaways

  • Whole home dehumidifier units cost $800 to $2,500, with installation labor adding $700 to $1,500 more for a typical home.
  • Homes with existing forced-air ductwork pay less to install because the system can tie into what is already there.
  • Homes without ducts or with radiant heating may need standalone units or new ductwork, which can double the total cost.
  • Capacity matters: a unit sized too small for your home will run constantly and cost more to operate; one sized too large wastes money upfront.

What the unit itself costs

Whole home dehumidifier units range from $800 for a basic 50-pint model to $2,500 for a high-capacity unit rated for larger homes. The price depends mainly on how much moisture the unit can remove per day, measured in pints. A 50-pint unit handles a 1,500 to 2,000 square foot home. A 70-pint or 90-pint unit works for 2,500 to 4,000 square feet. Larger homes or very humid climates need 100-pint or higher capacity, which costs more.

Brand reputation also affects price. Aprilaire, Honeywell, and Therma-Stor are the most common brands for whole home systems and typically cost more than generic models because they integrate better with existing HVAC systems and come with longer warranties. A Honeywell whole home dehumidifier usually costs $1,200 to $1,800 for the unit alone. An Aprilaire model runs $1,400 to $2,200.

Installation labor and ductwork changes

Installation labor typically costs $700 to $1,500 depending on your region and the complexity of your setup. A technician will assess your existing ductwork, determine where to connect the dehumidifier, and may support it works with your furnace or air handler. In most cases, the dehumidifier connects to your return air duct—the duct that pulls air back into your HVAC system—so the system can dehumidify all the air your home circulates.

If your ductwork needs modifications—rerouting, sealing leaks, or adding new runs—costs rise. A straightforward connection to existing ducts might cost $700. Rerouting ducts or adding new sections can add $300 to $800. If you have no ductwork at all, you will need either a standalone dehumidifier (which costs less upfront but only covers one area) or a new ductwork system installed, which can cost $2,000 to $5,000 on top of the dehumidifier itself.

How home size and humidity level affect price

A small home under 1,500 square feet with moderate humidity may need only a 50-pint unit ($800 to $1,200 plus $700 installation). A medium home of 2,000 to 3,000 square feet with high humidity typically needs a 70-pint unit ($1,200 to $1,600 plus $800 installation). A large home over 3,500 square feet or one in a very humid climate may need a 90-pint or larger unit ($1,600 to $2,500 plus $1,000 to $1,500 installation).

Humidity level matters because a home that stays at 50 to 60 percent relative humidity needs less capacity than one that regularly reaches 70 percent or higher. If you live in a humid region—the Southeast, Gulf Coast, or Pacific Northwest—your system will run more often and needs larger capacity to keep up. A contractor can measure your home's humidity and recommend the right size, which prevents you from buying too large (wasting money) or too small (running constantly and costing more to operate).

Operating costs once installed

A whole home dehumidifier uses 300 to 700 watts depending on capacity and how often it runs. If it runs 8 hours a day in summer, expect to add $15 to $40 per month to your electric bill during humid months. If it runs year-round in a very humid climate, annual operating cost is roughly $200 to $500. This is lower than running multiple portable dehumidifiers, which each use 300 to 700 watts and would need to run in every room.

The system also reduces strain on your air conditioner because the AC no longer has to remove as much moisture from the air. This can lower your cooling costs by 5 to 15 percent in humid climates, offsetting some of the dehumidifier's operating cost. Over time, the system pays for itself through lower AC bills and reduced mold and moisture damage to your home.

Whole home versus portable dehumidifiers

A portable dehumidifier costs $200 to $600 and needs no installation, but it only covers one room and must be emptied or drained regularly. If you have moisture problems throughout your home, you would need multiple units—one for each bedroom, the basement, and living areas—which costs $1,000 to $3,000 total and uses more electricity than a single whole home system.

A whole home system costs more upfront but covers your entire house, runs more efficiently, and requires no maintenance beyond occasional filter changes. It also protects areas you might forget to dehumidify, like crawl spaces and attics, which can develop mold if left damp. For homes with persistent humidity problems, a whole home system usually pays for itself within 5 to 10 years through lower energy bills and avoided water damage repairs.

When to get quotes from contractors

The only way to know the true cost for your home is to have a contractor assess your ductwork and HVAC system. Most HVAC companies offer free in-home estimates. Call three to five contractors in your area and ask them to measure your home's humidity level, evaluate your existing ducts, and recommend a unit size. They will give you a quote for the unit, installation, and any ductwork changes needed.

When comparing quotes, check that each one specifies the unit brand and capacity, the labor cost, any ductwork modifications, and the warranty. A quote that seems much lower than others may exclude ductwork assessment or warranty coverage. Ask whether the price includes a humidistat (a device that turns the system on and off based on humidity level) and how often the filter needs replacement.

Frequently Asked Questions

Can I install a whole home dehumidifier myself?

No. The system must connect to your HVAC ductwork and electrical panel, which requires a licensed HVAC technician. Improper installation can damage your furnace, create air leaks, or void your warranty. Hire a professional.

Do I need a whole home dehumidifier if I have air conditioning?

Not always. Air conditioning removes some moisture, but in very humid climates or homes with poor ventilation, AC alone may not keep humidity below 50 percent. If your home feels damp or smells musty even with AC running, a dehumidifier will help. A humidity meter costs $15 to $30 and tells you whether you need one.

What size dehumidifier do I need?

A contractor should measure your home's square footage and current humidity level to recommend the right capacity. As a rough guide: 50 pints for under 2,000 square feet, 70 pints for 2,000 to 3,000 square feet, and 90+ pints for over 3,500 square feet or very humid climates.

How long does installation take?

A straightforward installation into existing ductwork takes 4 to 8 hours. If ductwork needs modification or rerouting, add another 4 to 16 hours. Most jobs finish in one or two days.

Will a whole home dehumidifier lower my electric bill?

The dehumidifier itself adds $15 to $40 per month to your bill, but it reduces AC strain, which can save $20 to $60 per month in humid climates. The net effect is usually a small savings or break-even, plus the benefit of lower humidity and less mold risk.