How much does a crawl space dehumidifier cost in Virginia?

There is no standard price for a crawl space dehumidifier in Virginia, and a quote that names a number without seeing the space is guessing. What you pay comes from four things: the unit itself, how its water leaves, how it gets power, and what the crawl space needs before a dehumidifier can keep up. After that comes the running cost, which is electricity and filters.

One fixed number helps with the running cost: Virginia homes paid an average of 17.64 cents per kilowatt-hour for electricity in August 2026.^[1] Every 100 kilowatt-hours the unit uses costs about $17.64 at that average; your own rate is on your power bill.

The unit: portable or crawl space model

Portable dehumidifiers are the low end. ENERGY STAR sizes them at about 20 to 30 pints a day for a space under 2,000 square feet that feels damp and smells musty at times, 25 to 40 for one that is consistently damp, and 30 to 50 where walls or floors sweat or seepage is present.^[2] Two features matter more in a crawl space than in a basement: Frost can form on the coils below 65 degrees,^[2] so it needs a low-temperature rating, and it must drain by hose, because nobody empties a bucket under the house.

Crawl space units are built for cold, dusty spaces and continuous draining, and they are usually sold through installers rather than off a shelf. AprilAire's E070, for example, is rated at up to 70 pints a day for crawl spaces, basements and whole houses up to 2,200 square feet; the company sells it through its network of Healthy Air Professionals and recommends professional installation.^[3] It ships with 8-inch inlet and outlet duct collars, 10 feet of drain tubing and a washable MERV 8 filter,^[3] which tells you what an installer may add: ducting, a drain line and a mounting spot off the ground.

Efficiency. An ENERGY STAR certified unit uses 20% less energy^[2] than a similar conventional one. To compare models, look at the integrated energy factor, in liters of water removed per kilowatt-hour;^[2] a higher number costs less to run.

The drain

Gravity draining to a floor drain or sump is the simplest. If there is no low point to drain to, the job needs a condensate pump, which is another part to buy and maintain. For ducted whole-home units, Most whole-home dehumidifiers drain through a line that an HVAC professional routes to a floor drain or condensate pump during installation.^[2]

The power

ENERGY STAR's safety advice includes "Make sure the dehumidifier is connected to a properly grounded outlet."^[2] Many crawl spaces have no outlet at all, or an old one near the access door. Adding one is electrical work, which is usually best left to an electrician, and under the Virginia Uniform Statewide Building Code a permit is required before work on electric wiring.^[6] That can easily cost more than a portable unit, so ask about it at the first visit.

The prep

A dehumidifier is the drying step, not the whole fix. Crawlspaces must always have a drying mechanism,^[5] but if rain runs in or the dirt floor is bare, the unit runs constantly and wears out sooner. Many quotes therefore include a ground cover, vent sealing or full encapsulation. Ask for those as separate lines so you can see what the dehumidifier itself costs; see how much crawl space encapsulation costs in Virginia and how to lower crawl space humidity for the free and cheap fixes to do first.

The upkeep

Filters are the main recurring part. When we checked on October 26, 2026, the replacement filter for that model was listed at $28.70 on AprilAire's own store, and its wireless water sensor at $59.99.^[4] Other brands differ, so ask each installer what their unit takes and how often. Some installers also offer A monitoring system to inform the homeowner of relative humidity levels in the crawl space,^[10] which is worth having when the space is hard to get into.

What to ask for in a written quote

• The make, model and rated capacity in pints per day, and the humidity it will be set to hold.
• Where it will sit, and whether it is raised off the floor or liner.
• The drain route, and whether a condensate pump is included.
• Any electrical work, who does it, and whether the permit is in the price.
• Any ground cover, sealing or ductwork, priced separately.
• The warranty on the unit and on the labour, and what happens if humidity stays high.
• Filter type, replacement interval and cost.

Licence. Virginia's Class C contractor licence covers single jobs over $1,000 but less than $30,000,^[7] so any installer whose quote is above $1,000 should hold at least that licence. DPOR warns that A license number in an advertisement or on a business card does not necessarily mean the contractor’s license is valid.^[8] Check it on DPOR's License Lookup^[9] or see how to check if a contractor is licensed in Virginia.

Stop and call a pro if

• There is no grounded outlet near the crawl space, or the wiring down there looks damaged.
• Water stands on the floor after rain; that is a drainage job before it is a dehumidifier job.
• A gas furnace or water heater sits in the crawl space and the quote includes closing the vents.
• You want a ducted unit tied into the heating and cooling system.
• Mold covers more than a small patch, or the wood is soft.

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