Crawl Space Dehumidifier Installation
You may think adding a dehumidifier will solve your crawl space humidity issues. But without first encapsulating the crawl space, open vents, exposed soil, standing water, and outside air will continue feeding moisture into the space.
Southern Crawl Space Repair addresses the moisture sources through encapsulation, drainage, and other needed repairs, then installs the right professional-grade AprilAire® crawl space dehumidifier for the home. This complete approach controls humidity, condensation, musty odors, mold and fungal growth, wet insulation, and wood damage beneath your home.
Crawl space air also affects the air inside your home. Through the stack effect, air can move upward through gaps around plumbing, wiring, ductwork and floor framing. That airflow carries humidity, musty air, mold and fungal spores, and other airborne particles from the crawl space into the living areas above, where they may aggravate allergies or asthma.
A professional-grade AprilAire® crawl space dehumidifier helps control trapped humidity after the crawl space is sealed, reducing condensation, musty odors, mold-friendly conditions and moisture damage beneath the home.
Why Does Crawl Space Humidity Matter?
High crawl space humidity can damage the home itself. When humid air sits under the house, it can lead to:
Musty odors inside the home
Sweating ductwork
Condensation on ducts, pipes, or framing
Mold or fungal growth
Rust on HVAC components or metal hangers
Wet or falling insulation
Cupping hardwood floors or other moisture-related flooring issues
Recurring crawl space moisture problems
A crawl space dehumidifier helps remove trapped moisture from the air after the space is sealed, reducing condensation and helping keep humidity under control.
Charlotte’s outdoor humidity often exceeds the levels the CDC and EPA recommend for helping control mold. When a crawl space stays open to humid outside air and exposed ground moisture, it cannot reliably maintain those recommended levels. Learn how crawl space humidity contributes to mold, allergies, and indoor air concerns.
Condensation on crawl space wood framing is a warning sign that humid air is trapped under the home, creating conditions for mold, fungal growth, and wood damage.
Why We Only Use AprilAire® Dehumidifiers
Southern installs professional-grade AprilAire® crawl space dehumidifiers throughout the Charlotte area because we want crawl space systems built around quality, reliability, and long-term moisture control.
A crawl space is a demanding environment. The equipment may have to deal with humidity, dust, limited access, long run times, and conditions that are much tougher than a finished room inside the house.
AprilAire® offers professional-grade dehumidifiers designed for crawl spaces, basements, and whole-home humidity control. The right model depends on the size of the crawl space, whether it is encapsulated, how much humidity needs to be controlled, and how the system will drain.
AprilAire® is a registered trademark of Research Products Corporation. Southern Crawl Space Repair is not affiliated with or endorsed by AprilAire® unless otherwise stated.
Does an Encapsulated Crawl Space Need a Dehumidifier?
Yes. Encapsulation seals the crawl space, but it does not make humidity disappear. Once the crawl space is closed off, moisture in the air can stay trapped under the home unless it is actively removed and controlled.
A properly sized crawl space dehumidifier pulls moisture out of the air after encapsulation, helping reduce condensation on wood framing, ductwork, pipes, and vapor barriers. It also helps control the humidity conditions that lead to musty odors, mold, fungal growth, sweating ductwork, rust, wet insulation, and wood damage.
In Charlotte’s humid climate, encapsulation and dehumidification should work together: encapsulation helps keep humid outside air and ground moisture out, while the dehumidifier removes trapped humidity and keeps the crawl space under control.
Not sure how a ground vapor barrier differs from partial or full encapsulation? Compare the three moisture-control options.
Cold HVAC ductwork can cause humid crawl space air to condense, leaving water on top of the vapor barrier. Without dehumidification and proper water control, that moisture can create mold-friendly conditions and attract pests under the home.
What Our Crawl Space Dehumidifier Installation Options Include
Every crawl space is different. After the inspection, we recommend the right dehumidifier setup based on the size and condition of the space.
Crawl Space Inspection: We check humidity, moisture, vapor barrier condition, drainage, standing water, mold, insulation, and wood framing before recommending equipment.
Moisture Source Review: A dehumidifier controls air humidity, but it does not fix active water intrusion. We look for drainage problems, exposed soil, wet insulation, or other moisture sources first.
AprilAire® Dehumidifier Selection: We recommend the AprilAire® model that fits the crawl space conditions, size, and moisture-control needs.
Drainage Setup: The dehumidifier should drain properly so it can operate continuously without relying on a bucket that needs to be emptied by hand.
Placement and Airflow: The unit should be placed where it can operate effectively, remain accessible, and help manage humidity throughout the crawl space.
Maintenance Guidance: We explain how the system works and what basic maintenance may be needed to keep it performing properly.
Annual Maintenance For Crawl Space Dehumidifiers
A crawl space dehumidifier should be checked regularly to make sure it is operating, draining and controlling humidity properly.
Southern can inspect the filter, drain line, condensate pump, humidity setting and surrounding crawl space conditions as part of annual maintenance. Regular checks can help catch drainage, moisture or equipment problems before they lead to mold, odors, wet insulation or wood damage.
Strong Warranties. Clear Protection.
Southern backs our crawl space systems with clear written warranties.
25-Year Transferable Vapor Barrier Liner Warranty
Covers rips, tears and seam separation in Southern-installed vapor barrier liners.
25-Year Transferable Crawl Space Drainage Warranty
Covers Southern-installed crawl space drainage systems with required annual inspection and maintenance.
One-Year Workmanship Warranty
Covers Southern workmanship on services that do not include a separate written warranty.
Manufacturer Warranties
Dehumidifiers, sump pumps, battery-backup systems and other equipment include applicable manufacturer warranties.
Learn more about Southern’s Warranties.
Not sure what is going on in your crawl space?
Let us inspect your crawl space for free. We will explain the problem, if any, and recommend the right next step.
Crawl space dehumidifier cost depends on the size of the space, the equipment needed and whether sealing or drainage work is required first.
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