By Audrey HayesUpdated November 2026
An aprilaire whole home dehumidifier is built for homeowners who need to control moisture across a large area rather than in a single room. This review looks at the Aprilaire E100 Pro, a 100-pint commercial-grade unit intended for basements, crawlspaces and whole-house use in homes up to about 5,500 square feet. It is a strong fit for owners with persistent humidity, musty odors or a finished basement that stays damp, and for anyone who wants a unit rated for continuous duty. It is a poor fit for small apartments, homes that only need spot dehumidification, or buyers who want a compact unit that is quiet enough for a bedroom. Read on for the specifications, the trade-offs and how it compares with two other models in the same line.
Aprilaire E100 Pro 100-Pint Whole-House Dehumidifier, Energy Star Certified, Commercial-Grade Whole-Home Dehumidifier for Basement, Crawlspace, or Whole House up to 5,500 sq. ft.
Product Overview
The Aprilaire E100 Pro is a whole-house dehumidifier from Aprilaire, a company best known for whole-home air cleaning and humidity control equipment sold largely through the HVAC channel. Unlike portable room dehumidifiers that sit on the floor and collect water in a bucket, this class of unit is meant to be mounted in a basement, crawlspace or utility area and connected to a drain. Manufacturers describe it as a commercial-grade, Energy Star certified appliance designed to run for long periods, which is what distinguishes it from consumer portable models.
Because the E100 Pro is sized for large spaces, its main job is to reduce relative humidity across a whole level or an entire house. That makes it a different tool from a bedroom or closet dehumidifier. If you are weighing it against a small unit, the question is less about features and more about the total volume of moist air you need to handle. For more on that comparison, see Air Dehumidifier vs Air Purifier (2026): Which Is Better for Your Home?, which explains how the two device types differ in purpose.
Key Features & Specifications
The figures below come from the product name and the category characteristics that Aprilaire publishes for this model line. Confirm exact dimensions, electrical requirements and warranty terms on the current product page before buying, because installation details matter for a unit this size.
| Feature | Specification (as stated) |
|---|---|
| Capacity | 100 pints per day (rated) |
| Coverage | Up to 5,500 square feet |
| Intended locations | Basement, crawlspace, whole house |
| Certification | Energy Star certified |
| Build class | Commercial-grade |
| Drainage | Designed for continuous drain connection |
The “100-pint” rating refers to the moisture removed under standard test conditions, which typically assume a warm, humid room. Real-world output drops as temperature and humidity fall, so the rated figure is a ceiling rather than a daily guarantee. If your basement is cool, expect less water removal than the label suggests.
Pros & Cons
Pros
- High rated capacity suited to large basements and whole-house moisture problems.
- Commercial-grade construction intended for long run times.
- Energy Star certification signals efficiency compared with non-certified units of similar size.
- Designed for continuous drain operation, so you do not have to empty a bucket.
- Covers a range of applications, from crawlspaces to full-house use.
Cons
Performance Analysis
Performance for a unit like this depends on three things: how much moisture enters the space, how well the space is sealed, and whether the unit can run long enough to keep up. Owners of large-capacity dehumidifiers commonly report that the unit reaches its target humidity within a few days in a damp basement, then cycles on and off once the air is stable. That pattern is consistent with a correctly sized unit doing its job.
Energy Star certification means the unit meets efficiency criteria for its category, but operating cost still depends on your local electricity rate and how many hours the unit runs. Because a 100-pint machine draws meaningful power, many owners set a humidistat target around 50 percent and let the unit cycle, rather than running it flat out. Setting the target too low wastes energy and can cause over-drying of wood and finishes.
Look at the rated capacity as a maximum, not an average. Cold basements and crawlspaces often hold less moisture in the air, so the unit’s real output is lower. If your main concern is mold in a space that rarely warms up, the sizing decision matters more than the feature list. For mold-specific guidance on drying a space and preventing regrowth, see Dehumidifier to Remove Mold: How to Dry Out Your Home and Stop Regrowth.
Noise is the most common practical complaint in owner discussions. Commercial compressor units are louder than consumer models, and a basement installation usually keeps the noise contained. If the unit sits near living space, plan for vibration isolation and a location away from bedrooms.
Who Should Buy This Product?
This unit makes sense for homeowners with a finished or unfinished basement that stays persistently damp, a crawlspace that needs active moisture control, or a whole-house humidity problem that smaller units cannot address. It also suits people who want a permanent, drain-connected solution and are willing to arrange a drain route during installation.
Skip it if your problem is limited to one room, if you rent and cannot modify plumbing, or if you need a quiet appliance for a bedroom or office. A portable unit or a smaller whole-home model will serve those cases better and cost less to set up. For a broader look at the choice, Whole House Humidifier Installers: How to Choose and Hire the Right Pro (2026) covers how professional installation fits into these decisions.
Buying Guide
Start by measuring the area you need to dehumidify. Multiply length by width by height to get cubic feet, and compare that with the unit’s rated coverage. Units are sized for the square footage they state, so an accurate measurement prevents buying too little capacity. If you have a very damp space, pick the larger size rather than the smaller one.
Next, confirm the installation requirements before you order. You will need a floor drain, a condensate pump or a gravity drain route, and a reliable power circuit. Check whether your space has the clearances the manufacturer specifies. A professional can handle the drain and electrical work, and Installation of Whole House Humidifier: A Step-by-Step Guide (2026) outlines the general sequence most installers follow.
Consider these alternatives in the same family:
- Aprilaire E080 Pro – a smaller 80-pint commercial unit for basements and whole-house use up to about 4,400 square feet. A good choice if your space is below the E100 Pro’s range.
Aprilaire E080 Pro 80-Pint Whole-House Dehumidifier, Energy Star Certified, Commercial-Grade for Basement, Crawlspace or Whole House up to 4,400 sq. ft.
- Aprilaire E080W Smart Wi-Fi – an 80-pint Energy Star unit with Wi-Fi control, a pump, a drain hose, a hanging kit and a MERV 11 filter. Suited to owners who want remote monitoring and a filter in the package.
Aprilaire E080W Smart Wi-Fi Whole-House Dehumidifier, 80-Pint Energy Star Commercial Dehumidifier for Basement, Crawl Space & Home up to 4,400 Sq.Ft. with Pump, Drain Hose, Hanging Kit, MERV 11 Filter
When comparing, weigh coverage, control features, and whether you want a filter and pump included. Also think about how the unit will fit with other equipment. If you are considering combining moisture and air-quality control, 6 Best Dehumidifier and Air Cleaner Combos for Home Use (2026) looks at that category.
FAQ
How big an area can the Aprilaire E100 Pro handle?
The product name lists coverage up to 5,500 square feet. That figure assumes typical conditions and a space with reasonable sealing. Larger or leakier spaces may need a second unit or better air sealing first.
Does it need to be drained to a floor drain?
Units of this class are designed for continuous drainage, which usually means a floor drain or condensate pump. A bucket-only setup is generally impractical at this capacity, so plan the drain route before buying.
Is the E100 Pro Energy Star certified?
Yes, the listing identifies it as Energy Star certified. That indicates it meets the program’s efficiency criteria for its category, though actual operating cost depends on your electricity rate and run hours.
Will it work in a cold basement or crawlspace?
It will operate in cooler spaces, but its water removal drops as temperature falls. In very cold conditions, expect reduced output, and consider whether a unit with defrost or low-temperature operation suits your space.
How loud is a commercial dehumidifier like this?
Commercial compressor units are louder than consumer models. Owners generally place them in basements or utility rooms away from sleeping areas. Vibration isolation can reduce noise transfer.
Can I install it myself?
Some homeowners handle mounting and drain setup, but electrical connection and drain work often require a licensed professional, depending on local code. If you are unsure, consult a licensed electrician or HVAC professional before installing.
What maintenance does it need?
Plan to clean or replace filters on the schedule the manufacturer specifies, keep the drain clear, and check the coils periodically. Regular upkeep keeps the unit running efficiently and extends its service life.
Final Verdict
The Aprilaire E100 Pro is a serious option for homeowners with large, persistently damp spaces who want a commercial-grade, drain-connected dehumidifier rather than a portable unit. Its 100-pint rating, Energy Star certification and whole-house coverage make it well suited to basements and crawlspaces, provided you have a drain route and can tolerate the noise and footprint. Buyers with small rooms, rental restrictions or quiet-space needs should look at smaller or portable models instead. Confirm the specifications on the current listing and consult a licensed professional for installation.
About Audrey Hayes
Audrey Hayes is part of our editorial team and reviews and edits our indoor air guides, checking product details against manufacturer specifications and owner feedback.
