The 6 Best Whole House Dehumidifiers

1. How We Picked

We did not install six whole house dehumidifiers in one building and run them through a humid summer, and we will not pretend otherwise. This guide is built from manufacturer specification sheets, ENERGY STAR listings, retailer pages that repeat the manufacturer's ratings and the way these units are specified by HVAC contractors. Every capacity, airflow and electrical figure on this page is attributed to its source, and where sources disagree we say so rather than picking the more flattering number.

We looked for three things. First, a published capacity at a realistic condition as well as the headline. The AHAM rating point of 80°F and 60 percent relative humidity flatters every unit, and the manufacturers that also publish a figure at 73°F or 60°F gave us something honest to size against. Second, a believable square-footage rating. Several units carry one coverage figure from the manufacturer and a different one from a retailer, and we used the manufacturer's whenever we had it.

Third, we wanted range. Some houses are humid because they are tight and need fresh air as well, some because a basement or crawl space is pumping moisture into the living space, and some because the air conditioner simply cannot keep up with latent load. One unit does not suit all three, so the six picks cover ducted, ventilating and low-temperature basement designs, and the sections below explain which kind of house each one fits.

If you have not yet decided whether you need a ducted unit at all, start with our comparison of whole house versus portable dehumidifiers. For many houses with one damp basement, a good portable from our basement dehumidifier guide is the cheaper answer, and that page models the fifteen-year cost of both routes.

2. Ducted, Ventilating or Basement-First

A standard ducted whole house dehumidifier sits in a basement, attic or utility room and connects to the HVAC system, usually pulling air from the return side and pushing dried air back into the supply or return. The Aprilaire E100 and E070 and the Honeywell DR90 are this kind. They use the existing duct system to spread dry air through the house, which is efficient, but they depend on that system's airflow being designed for them, and the install has to be balanced against the furnace or air handler.

A ventilating dehumidifier adds a fresh-air intake. The Santa Fe Ultra V100 and Ultra70 can draw a measured stream of outdoor air, filter it and dry it before it enters the house. That matters in very airtight new construction, where the house needs mechanical ventilation anyway and outdoor air arrives humid in summer. In a leaky older house, the ventilation port adds little, because the house is already getting plenty of outside air through gaps you did not plan.

A basement-first unit, like the AlorAir Sentinel HDi90, is really a high-capacity basement and crawl space dehumidifier that can be ducted. It is the right tool when the moisture source is below grade, which is common. Drying the basement or crawl space often lowers humidity upstairs too, and our article on whether a basement dehumidifier helps the whole house explains when that works and when it does not. These units also run at lower temperatures than the ducted machines, which matters in a cold basement.

All of them are refrigerant designs: a cold coil condenses water out of the air, and the water runs to a drain. None of them is a desiccant unit, and none of them heats the air the way a desiccant machine does. That makes them efficient at normal indoor temperatures and progressively weaker as the air gets colder, which is why the realistic ratings in the next section matter so much.

3. Our 6 Picks

Every figure below comes from the manufacturer's specification sheet, an ENERGY STAR listing or a retailer listing repeating the manufacturer's rating, and we note where sources disagree. We researched these units from published specs; we did not lab-test them.

4. Sizing: Ignore the Headline Pint Rating

Every whole house dehumidifier is sold on its pint rating at 80°F and 60 percent relative humidity, the AHAM test condition. Very few houses spend the summer at 80°F. Most air-conditioned homes sit around 72 to 75°F, and a basement may be cooler still. At those temperatures, capacity drops, and the manufacturers that publish a second rating show by how much: Aprilaire's E100W sheet gives 85 pints at 73°F against 100 at 80°F, Santa Fe gives 82 against 100 for the V100, and Honeywell gives 65 at 70°F and 47 at 60°F against 90 at 80°F.

So size against the cooler number. A house that needs roughly 60 to 70 pints a day of moisture removal in midsummer is a candidate for a 100-pint-class unit, not a 70-pint one, because the 70-pint unit delivers closer to 50 at normal indoor temperatures. If the unit will live in a cool basement, use the 60 or 70°F figure where one exists, and expect less than the headline even from a good machine.

Square-footage ratings are even less reliable. The same Aprilaire E100 is listed at 5,500 square feet by one source and 3,000 by another, and the Ultra V100 at 2,300 by Santa Fe and 3,600 by a retailer. Those figures assume a particular house tightness, ceiling height and moisture load that may look nothing like yours. Santa Fe at least states its assumption, a 10-foot ceiling, which is a reminder that volume rather than floor area is what the unit actually has to dry.

The honest way to size is to measure. Put a decent hygrometer in two or three rooms for a couple of weeks of humid weather, note how high relative humidity climbs, and give the numbers to the installer. A contractor who sizes from a load calculation rather than a square-foot chart is worth hiring for that reason alone. If your basement alone is the problem, our guide to sizing a basement dehumidifier covers that simpler case.

5. Installation and Ductwork

This is where whole house dehumidifiers get expensive. Equipment for this class typically runs roughly $1,200 to $2,500. A standalone install, where the unit dries a basement or two zones through its own short duct runs, typically adds $500 to $1,200. Integrating it with the existing HVAC system, which is the configuration that actually dries the whole house, commonly adds $800 to $1,500, because the installer has to size and balance it against the system's airflow. Those are typical ranges, not quotes, and local labor rates swing them.

There are three common duct layouts. Return-to-return pulls air from the return duct and pushes it back into the return upstream of the air handler, so the furnace blower spreads it. Return-to-supply pushes dried air into the supply side. A dedicated layout gives the dehumidifier its own intake and supply grilles, often in a basement, and leaves the HVAC system alone. The right choice depends on your system, and a good installer will explain why they chose one.

Every unit here needs a condensate drain, because 70 to 100 pints a day is far too much water for a bucket. A floor drain or a utility sink within reach is ideal. Without one, you need a condensate pump, and our guide to dehumidifiers with pumps covers the same lift-and-distance questions that apply here. Make sure the drain line slopes, is trapped where the manufacturer requires it, and cannot freeze if it runs through a cold space.

Electrically, most of these units run on an ordinary 120-volt circuit, with listed draws between about 5.3 and 6.7 amps. That is modest, but a dedicated circuit is still a good idea for something that may run many hours a day. Some variants are hard-wired and some plug in, so check which version the installer is quoting. Finally, plan access: filters need changing, and a unit wedged into a crawl space with no room to pull the filter will not get maintained.

6. Controls and Where to Set Them

A whole house dehumidifier is only as good as the control that runs it. Most can be run from a wall-mounted dehumidistat or a compatible smart thermostat, and some have Wi-Fi variants. The control should sense humidity in the living space, not just at the unit's intake in the basement, otherwise it will happily dry the mechanical room while the bedrooms stay sticky.

For most homes, a setpoint around 45 to 50 percent relative humidity is the sweet spot. Below about 40 percent, you are paying to remove moisture you do not need to remove, and in winter you may be working against a humidifier. Above about 55 to 60 percent, dust mites and mold get comfortable, which is the problem the unit is there to solve. Start at 50 percent and adjust based on what the hygrometers tell you over a few weeks.

If your system has a ventilating unit like the Ultra V100, the control also schedules fresh air. In humid weather the unit dries that incoming air before it reaches the house, which is the main reason to choose a ventilating design over a plain one. Make sure the installer sets the ventilation rate to what the house actually needs; more is not better if it means bringing in more humid air than the unit can handle.

Finally, coordinate it with the air conditioner. An oversized AC short-cycles and removes little moisture, which is often why the house is humid in the first place. Running the dehumidifier lets you set the thermostat a degree or two higher and stay comfortable, which can claw back some of its electricity cost. A contractor who understands latent load will set both systems to cooperate rather than fight.

7. Running Cost and Efficiency

Whole house units are more efficient per pint than most portables, which is one of the few cost arguments in their favor. Santa Fe lists 6.4 pints per kilowatt-hour for the Ultra V100 at the AHAM point, Honeywell lists about 6.1 pints per kilowatt-hour for the DR90, and AlorAir lists 2.69 liters per kilowatt-hour, or about 5.7 pints, for the Sentinel HDi90. ENERGY STAR lists the Ultra V100 at 419 kilowatt-hours a year, which is a useful anchor for a typical installation.

To estimate your own cost, take the listed wattage and multiply by the hours it will run and your electricity rate. The Ultra V100 draws about 620 watts at 73°F per Santa Fe. If it runs ten hours a day for 150 humid days, that is about 930 kilowatt-hours, or roughly $158 a season at 17 cents per kilowatt-hour. A unit running fewer hours, or in a drier climate, costs proportionally less. Our guide to how much electricity a dehumidifier uses walks through the same math for portables, so you can compare.

The efficiency gap against portables is real but rarely large enough to pay back the higher equipment and installation cost on its own. Where whole house units win is in coverage, convenience and the fact that one well-placed unit replaces two or three portables that would each need emptying, filters and eventual replacement. If you are humid throughout the house, that convenience is the real reason to buy one.

Filters are the other running cost. Honeywell uses a standard MERV 11 filter, Aprilaire's E070 a washable MERV 8, and Santa Fe's filters vary by package. Budget for filter changes on the manufacturer's schedule, and check them more often if the unit pulls from a dusty basement. A clogged filter lowers airflow, and lower airflow means less moisture removed for the same electricity.

8. Maintenance and Lifespan

Whole house dehumidifiers need little maintenance, but what they need is not optional. Change or wash the filter on schedule. Check the condensate line every season for algae or sediment, because a blocked drain will either shut the unit off or, worse, overflow into the space around it. Pour a little diluted bleach or a manufacturer-approved line cleaner through it once a year if your installer recommends it.

Keep the coil clean. If the filter has done its job, the coil should stay clean for years, but a unit that ran without a filter or with a torn one may need the coil cleaned by a technician. Listen for changes in noise, which often mean a fan bearing is wearing, and watch for the unit running constantly without lowering humidity, which can mean a refrigerant problem or an undersized unit.

Warranties vary by manufacturer and model, and retailers list Aprilaire's E070 with a five-year warranty, for example. Read the specific terms before you buy: some cover parts only, some cover the refrigeration system longer than the rest, and most require professional installation and registration. Labor is often excluded, which matters for a unit that needs a technician to swap anything.

A well-installed unit with a clean filter and a clear drain should last many years, and the ductwork and drain you install with it will outlive the first unit. That is worth remembering when comparing quotes: paying a little more for a careful duct design and a properly trapped drain line is money that keeps working when the dehumidifier itself is eventually replaced.

9. Match a Pick to Your House

If you have forced-air HVAC, a humid house of average size and no special ventilation needs, the Aprilaire E100 is the place to start. It has the most capacity at a realistic temperature, a long product lineage and enough variants to fit most mechanical rooms. Size it against its 85-pint rating at 73°F, not the 100-pint headline.

If your house is new and very airtight, the Santa Fe Ultra V100 is the one to price, because it handles the fresh air the house already needs. For a smaller tight house, the Ultra70 does the same job in a compact cabinet. If you want the plainest view of how capacity changes with temperature, the Honeywell DR90's published 60, 70 and 80°F figures make it easy to size honestly.

If your house is modest in size, or most of your humidity comes up from a crawl space, the Aprilaire E070 is properly sized rather than oversized, and its slim cabinet fits where larger units will not. If your basement is cold and damp and you want a lower-cost route that still pushes dry air upstairs, the AlorAir Sentinel HDi90 runs lower down the thermometer than any ducted unit here.

And if only one damp basement is the problem, consider skipping whole house altogether. A good portable from our basement dehumidifier guide, or a low-temperature unit from our crawl space dehumidifier guide, may solve it for a fraction of the cost. If the problem is a cold garage instead, our garage dehumidifier guide covers units built for low temperatures.