Crawl Space Dehumidifier Cost (2026)
A crawl space dehumidifier costs $800 to $3,500 installed. The unit itself is $700 to $2,200, installation $200 to $900, and running it $15 to $50 a month. It is the component that makes encapsulation actually work — a sealed crawl space with no way to remove moisture can hold humidity rather than shed it.
- How much does a crawl space dehumidifier cost?
- A crawl space dehumidifier costs $800 to $3,500 installed. A 70 to 90 pint unit — the usual specification for an encapsulated crawl space — is $1,400 to $3,000 with installation. Running it costs $15 to $50 a month, or $180 to $600 a year.
- Can I use a regular household dehumidifier in a crawl space?
- It will work briefly and fail early. Household units are not built for low ambient temperatures, continuous duty or the dust of a crawl space, and they need manual emptying somewhere nobody goes. A $350 portable typically lasts a season or two against a crawl space unit’s 8 to 10 years.
- What size dehumidifier does my crawl space need?
- Roughly 70 pints per day for a 1,500 to 2,000 square foot sealed crawl space, moving to 90 to 100 pints for larger or persistently damp spaces. Undersizing is the most common error, and it shows up as a unit that runs continuously and still cannot hold humidity under 60%.
- Do I need a dehumidifier if the crawl space is encapsulated?
- In most of the humid United States, yes. Encapsulation stops new moisture entering but does not remove what is already there or what arrives through the hatch and the building itself. The alternative is supplying conditioned air from the HVAC system, which some contractors prefer and which has its own code requirements.
| What you're pricing | Low | Typical | High |
|---|---|---|---|
| Household portable unitNot rated for crawl space conditions; short life | $200 | $350 | $600 |
| 50–70 pint crawl space unit, installedSuits spaces up to about 1,500 sq ft | $900 | $1,500 | $2,400 |
| 70–90 pint crawl space unit, installedThe common specification for a full encapsulation | $1,400 | $2,000 | $3,000 |
| 100+ pint unit, installedLarge or persistently wet spaces | $2,200 | $3,000 | $4,500 |
| Add: condensate pump and drain lineWhere gravity drainage is not available | $150 | $350 | $700 |
| Add: dedicated electrical circuitFrequently needed and frequently omitted from quotes | $250 | $500 | $1,100 |
| Annual running costAt roughly $0.16/kWh, sealed space | $180 | $350 | $600 |
What drives the price
- Capacity
- Pints per day is the spec that sets the price. Correct sizing costs less over ten years than an undersized unit running continuously.
- Drainage
- Gravity to a sump or to daylight is free. Anywhere else needs a condensate pump at $150 to $700.
- Power
- Many crawl spaces have no usable circuit. Running one is $250 to $1,100 and is a common omission from a headline quote.
- Whether it is bundled
- Some encapsulation quotes include the dehumidifier and some price it separately. This is the single most frequent reason two encapsulation quotes differ by $2,000.
The number that matters is 60%
Below roughly 60% relative humidity, mold cannot establish on wood. Above it, given time, it will. That threshold is the entire purpose of the equipment, and it is the number to ask about — not the pint rating, not the brand.
A hygrometer costs $15 and settles the question of whether you need any of this. If the crawl space sits below 60% through a humid August, the moisture problem is already handled. If it sits at 75%, no amount of plastic sheeting alone will bring it down.
Common questions
- How much does a crawl space dehumidifier cost?
- A crawl space dehumidifier costs $800 to $3,500 installed. A 70 to 90 pint unit — the usual specification for an encapsulated crawl space — is $1,400 to $3,000 with installation. Running it costs $15 to $50 a month, or $180 to $600 a year.
- Can I use a regular household dehumidifier in a crawl space?
- It will work briefly and fail early. Household units are not built for low ambient temperatures, continuous duty or the dust of a crawl space, and they need manual emptying somewhere nobody goes. A $350 portable typically lasts a season or two against a crawl space unit’s 8 to 10 years.
- What size dehumidifier does my crawl space need?
- Roughly 70 pints per day for a 1,500 to 2,000 square foot sealed crawl space, moving to 90 to 100 pints for larger or persistently damp spaces. Undersizing is the most common error, and it shows up as a unit that runs continuously and still cannot hold humidity under 60%.
- Do I need a dehumidifier if the crawl space is encapsulated?
- In most of the humid United States, yes. Encapsulation stops new moisture entering but does not remove what is already there or what arrives through the hatch and the building itself. The alternative is supplying conditioned air from the HVAC system, which some contractors prefer and which has its own code requirements.
How we price this. Figures are national 2026 estimates built from contractor quote ranges, material pricing and regional labour rates, then cross-checked against published industry cost data. Reckon Home does not sell, broker or perform this work. Use these numbers to judge whether a quote is reasonable — not as a quote.