Crawl Space Dehumidifier Installation Near Fairfield Bay, AR
A crawl space dehumidifier installed by That Crawl Space Encapsulation Guy costs $1,500 to $2,500, and the install takes 2 to 4 hours. Christian Olson checks first whether your crawl space is closed up enough for a dehumidifier to keep up. He works within 30 miles of Fairfield Bay, and the $100 inspection comes off your price if you hire him.
- Typical price
- $1,500 to $2,500 installed
- Time on site
- 2 to 4 hours
- Where
- Within 30 miles of Fairfield Bay
Humid air under the floor keeps the joists, ducts, and insulation damp
Air in a damp crawl space carries enough water to wet anything cooler than it. Joists soak it up, ducts and cold water pipes sweat, and the insulation under the floor gets heavy and sags.
Summers here put a lot of water in that air. At Clinton Municipal Airport, about 9 miles west, the dew point averaged 71.4°F in July from 2015 to 2024.
Wood that stays damp grows mold and, in time, rots. The University of Arkansas Cooperative Extension notes that high humidity in poorly ventilated crawl spaces lets joists absorb moisture, which makes termite damage easier.
The first things people ask about a crawl space dehumidifier
Something not here? Call and ask Christian.
(501) 550-1115How long does it take to install a crawl space dehumidifier?
Most installs take 2 to 4 hours. That Crawl Space Encapsulation Guy works under the floor through the crawl space access, so you can stay home while the unit goes in.
Do I need a dehumidifier if my crawl space is already encapsulated?
Not always. Some sealed crawl spaces stay dry with the liner and sealed vents alone. Christian decides at the $100 inspection, and That Crawl Space Encapsulation Guy writes the reason on your price.
What if you find mold or rot while you're down there?
Christian stops and gives you a written price for the new problem before he does any more. That Crawl Space Encapsulation Guy prices mold removal at $1,000 to $2,500, on its own line.
A dehumidifier keeps the air dry in a crawl space that's closed off
A crawl space dehumidifier is a machine that sits or hangs under the floor and pulls water out of the air. The water it collects has to drain somewhere, and the unit needs power to run.
It does its job in a crawl space that's closed off from the ground and the outside air, with plastic over the dirt and the vents sealed. That's why Christian works in one order: water first, wood second, air last. The dehumidifier is the air part.
The unit's size has to fit the crawl space. A unit too small for the floor area and its damp runs and runs without catching up. The 2018 International Residential Code sized crawl space dehumidification at 70 pints of water a day for every 1,000 square feet of floor.
The goal is the humidity the EPA gives for indoor air: below 60%, ideally 30% to 50%, to keep mold from growing.
How a dehumidifier install goes, from the inspection to the last day
- The $100 inspectionChristian goes under the house and checks the vents, the floor, any water getting in, and the room there is for a unit.
- A written price within 24 hoursEvery line has a reason: the dehumidifier, and any water, wood, or sealing work that has to come first.
- Water and sealing first, if your price lists themStanding water, open vents, or a bare dirt floor get handled before the unit goes in.
- The dehumidifier goes inThe install takes 2 to 4 hours. If Christian damages a duct, drain line, or sprinkler line while working, he pays to fix it.
- Work done, with the maker's warrantyThe unit carries its maker's warranty, and Christian's own phone rings around the clock if anything he installed isn't right.
A crawl space dehumidifier costs $1,500 to $2,500 installed
That's the range for one dehumidifier installed in most crawl spaces. Your written price comes within 24 hours of the inspection and lists the unit and anything else the crawl space needs, each with a reason.
If you hire us for the dehumidifier, the whole $100 inspection comes off its price. The deposit pays for the unit, and you pay the rest in stages as the install gets done.
What a dehumidifier won't fix
A dehumidifier won't remove standing water. Puddles under the house, or water running in after rain, need drainage or a sump pump first, or the unit just pulls on the same water day after day.
It also won't keep an open, vented crawl space with a bare dirt floor dry, because outside air and ground moisture keep coming in. Advanced Energy ran a field study published by the U.S. Department of Energy. Its vented crawl spaces often ran above 80% humidity in summer, while closed ones generally stayed below 60%. A unit in a vented crawl space can run all day and do little. Christian tells you at the inspection when the crawl space needs closing up first.
Work that often goes with this
Why does my crawl space dehumidifier run all the time?
Usually because damp keeps coming in faster than the unit can pull it out. An open vent, a bare dirt floor, water under the house, or a unit too small for the space can each cause it. That Crawl Space Encapsulation Guy looks for all four at the $100 inspection.
Where does the water from the dehumidifier go, and how does it get power?
Most crawl space units drain through a line, by gravity or with a small condensate pump. The unit also plugs into an outlet. Ask to see both on your written price; That Crawl Space Encapsulation Guy gives every line a reason.
Who looks after the dehumidifier once it's in?
That Crawl Space Encapsulation Guy does. A dehumidifier service visit runs $125 to $175, and Christian answers his own phone around the clock if the unit stops working.
Will a dehumidifier fit in a low crawl space?
It depends on the room under the floor, which also decides where the unit can sit or hang. The University of Arkansas Cooperative Extension gives 18 inches from the ground to the bottom of the joists as the minimum crawl space clearance. That Crawl Space Encapsulation Guy checks the room at the $100 inspection.
Call Christian for a $100 inspection and a written dehumidifier price
(501) 550-1115Inspection $100 within 30 miles of Fairfield Bay, credited to your job. Open 24 hours, every day.