Portable dehumidifiers that you empty by hand every day are a losing battle in a genuinely damp house. The Aprilaire E100 whole house dehumidifier removes up to 100 pints of moisture a day and drains automatically, protecting your whole home from the mold, musty smells, and structural damage that excess humidity causes. If you have a damp basement, a humid climate, or persistent condensation, the Aprilaire E100 whole house dehumidifier is a serious, install-and-forget solution.
This guide covers the E100’s capacity and specs, how it installs, the control options, real costs, and the maintenance that keeps it running for a decade or more.
- What the E100 Is Built to Do
- Capacity and Coverage
- Installation Options
- Controls and Humidity Management
- What It Costs
- Energy Use and Efficiency
- Maintenance for Long Life
- E100 vs E070 vs Portable Units
- Where to Install the Unit
- Health and Home Benefits of Controlling Humidity
- Is the E100 Right for Your Home
What the E100 Is Built to Do
The E100 is a high-capacity whole-house dehumidifier designed to handle the moisture load of an entire home or a large problem area like a basement. Rated to pull up to 100 pints of water per day, it far outpaces the 30 to 50 pint portable units sold at big-box stores, and it does the job continuously without a bucket to empty.
Aprilaire builds these units with a corrosion-resistant aluminum coil and a housing designed for years of continuous duty. Unlike a portable that lives in a corner, the E100 is meant to be installed as part of your home’s mechanical system and left to run automatically based on humidity readings.
Capacity and Coverage
The 100-pint-per-day rating makes the E100 suitable for homes up to roughly 5,500 square feet, though coverage depends on how damp the space is and how tightly the home is sealed. For comparison, Aprilaire also sells the smaller E070 (70 pints) for tighter or drier homes, so choosing the E100 makes sense when moisture is a real, persistent problem.
Coverage benchmarks to keep in mind:
- Damp basements that feel humid or smell musty are prime candidates for the E100’s higher capacity.
- Humid climates in the Southeast and Gulf regions push moisture loads higher, favoring the larger unit.
- Whole-home coverage works best when the unit is tied into ductwork so dry air distributes evenly.
Installation Options
The E100 offers flexible installation, which is a big part of its appeal. You can set it up as a freestanding unit in a basement or crawl space, or duct it into your HVAC system for whole-house coverage. A professional HVAC installer typically handles the ducted setups, while a handy homeowner can manage a standalone install.
There are three common configurations:
- Freestanding in the space that needs drying, drawing and discharging air locally with a gravity or pump drain line.
- Supply-side ducted, where dry air is fed into the home’s supply ductwork.
- Dedicated return ducting, pulling humid air from problem areas and returning dry air through the system.
The unit drains continuously through a hose to a floor drain, condensate pump, or sump, so you never lift a bucket. Plan the drain path during installation to avoid clogs and backups.
Controls and Humidity Management
The E100 includes an onboard control that lets you set a target relative humidity, and it runs automatically to hold that level. Most homeowners set it between 45% and 55%, the sweet spot for comfort and mold prevention. Below 40% the air feels dry and static-prone, while above 60% mold and dust mites thrive.
For more integrated control, the unit pairs with Aprilaire automatic digital dehumidistats and compatible thermostats, allowing the dehumidifier to coordinate with your HVAC system. That integration means the system can dehumidify even when the air conditioner is not actively cooling, which is exactly when shoulder-season humidity creeps up.
What It Costs
The E100 unit itself typically runs $1,300 to $1,800. Professional installation, especially for a ducted whole-house setup, adds $500 to $1,500 depending on complexity, drain routing, and electrical work. A standalone basement install costs less than a fully integrated ducted system.
Compared with buying and constantly running multiple portable dehumidifiers, the E100 often makes financial sense over time. It uses energy more efficiently per pint removed, requires no daily attention, and protects finishes, framing, and stored belongings from moisture damage that can cost far more to repair.
Energy Use and Efficiency
Whole-house dehumidifiers draw more power than a small portable, but they remove far more moisture per unit of energy and run only as needed to hold the setpoint. The E100 draws roughly 7 to 8 amps during operation, and because it cycles based on humidity rather than running flat out, monthly energy cost stays reasonable for the amount of water it removes.
Running the dehumidifier can even reduce overall cooling costs, since drier air feels cooler and lets you set the thermostat a degree or two higher in summer without losing comfort. Removing moisture is often more effective than lowering the temperature for that sticky, humid feeling.
Maintenance for Long Life
The E100 is low-maintenance, but a little attention keeps it running efficiently. The unit uses a washable or replaceable filter that should be checked every few months and cleaned or swapped as needed. Keep the coil clear of dust, and periodically confirm the drain line is flowing freely with no clogs or algae buildup.
Once a year, inspect the drain, clean the filter thoroughly, and check that the control is holding the target humidity. With this basic upkeep, an E100 commonly lasts 10 to 15 years, far outliving the disposable portables it replaces.
E100 vs E070 vs Portable Units
Aprilaire sells the E100 alongside the smaller E070, and choosing between them and a portable comes down to your moisture load and home size. The E070 handles up to 70 pints a day and suits tighter or moderately damp homes up to around 3,800 square feet, while the E100’s 100-pint capacity covers larger or seriously damp spaces up to roughly 5,500 square feet.
Portable dehumidifiers, by contrast, top out around 30 to 50 pints and require you to empty a tank by hand daily or babysit a drain hose. They make sense for a single small room, but for whole-home or basement moisture problems they simply cannot keep up. The E100’s automatic drainage and far higher capacity make it the practical choice whenever moisture is a persistent, whole-house issue rather than a localized nuisance.
Where to Install the Unit
Placement affects how well the E100 protects your home. In a basement, position it centrally so it can draw humid air from the whole space, and keep it off the floor on a stand or shelf if flooding is ever a concern. For whole-house coverage, ducting it into the return side of your HVAC system distributes dry air evenly to every room.
Give the unit clearance for airflow around the intake and exhaust, and plan the drain route carefully so gravity carries condensate to a floor drain or a condensate pump lifts it to one. Locating it near an existing drain and a dedicated electrical circuit simplifies installation and keeps the drain line short and unlikely to clog.
Health and Home Benefits of Controlling Humidity
Keeping indoor humidity in the 45% to 55% range does more than improve comfort. It discourages mold and mildew growth, which protects both your health and your home’s structure and finishes. Dust mites, a common allergy trigger, cannot thrive in drier air, so allergy and asthma sufferers often notice real relief.
Excess moisture also damages the home itself, warping wood floors and trim, peeling paint, rusting metal, and creating the musty smell that signals hidden mold. By holding humidity steady, the E100 protects hardwood flooring, cabinetry, stored belongings, and framing from moisture damage that can cost thousands to repair. The unit essentially pays for itself in prevented damage over its long service life.
Is the E100 Right for Your Home
Choose the Aprilaire E100 whole house dehumidifier if you have a genuinely damp home, a problem basement, or you live in a humid region where portable units cannot keep up. The 100-pint capacity, automatic drainage, flexible installation, and integration with your HVAC system make it a true set-and-forget solution.
If your moisture problem is minor or confined to a small space, a portable or the smaller E070 may be enough. But for serious, whole-home humidity control that protects your house and your comfort year-round, the E100 is one of the most capable and reliable units a homeowner can install.
