A whole-basement dehumidifier installed with a condensate pump and a hard-piped drain runs about $1,800 to $3,800 in New Jersey; a ducted unit that dries a crawl space and a basement together runs $2,800 to $5,500. The number to aim for is 45 to 55 percent relative humidity. Below that you're wasting electricity. Above 60 percent, mold grows on joists, boxes and the back of the drywall whether or not you ever see a drop of water on the floor.
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A whole-basement dehumidifier installed with a condensate pump and a hard-piped drain runs about $1,800 to $3,800 in New Jersey; a ducted unit that dries a crawl space and a basement together runs $2,800 to $5,500. Typical price: $1.8K – $5.5K. Licensed & insured, written itemized price before work starts, no deposit, one dedicated crew. Serving all 21 New Jersey counties from Paramus. Call (201) 676-3099 or book a free estimate.
| Relative humidity | What's happening | What to do |
|---|---|---|
| Under 40% | Drier than it needs to be. Wood trim and furniture can shrink and check. | Dial the humidistat back. You're paying for electricity you don't need. |
| 45–55% | The target. Mold can't get going, dust mites struggle, the air smells like nothing. | Leave it. Change the filter twice a year. |
| 55–60% | Borderline. Cardboard boxes start to feel soft, you notice it when you go down the stairs. | Set the humidistat to 50% and see whether the unit can hold it. |
| 60–70% | Mold is growing on joists, boxes, leather and the back of drywall. This is the classic musty-basement smell. | You need a properly sized unit and a look at where the water is coming from. |
| Over 70% | Condensation on cold surfaces, active mold, rusting tools, possible standing water somewhere. | Find the water source first. A dehumidifier alone won't win this one. |
A dehumidifier pulls moisture out of air. It does not stop water coming in. If your humidity is high because a downspout dumps at the foundation, because the grade runs toward the house, because the sump pit has no lid, or because a crawl space has bare dirt in it, the machine will run forever and lose.
So we look first: gutters and downspouts, grade, window wells, the cove joint, the sump lid, the dryer vent, and whether the bath fans upstairs are actually ducted outside. Half the 'we need a dehumidifier' calls we get turn out to be a $300 downspout extension and a sealed sump lid, and we'll tell you that even though it's the smaller ticket.
Putting a dehumidifier in a vented crawl space with a dirt floor is like air conditioning your driveway. Open vents pull in humid summer air that condenses on cool surfaces, and bare earth puts gallons of moisture into the air every day.
The sequence is: seal the floor and walls with a reinforced vapor liner, close the vents, insulate and air-seal the rim joist, then hang a dehumidifier sized to the space with its condensate hard-piped or pumped out. Done that way, a crawl space holds 50 percent all summer and the floors above it stop feeling cold and damp. Done backwards, you buy a machine that never shuts off.
We measure the space, take a humidity reading, look for the water source, and check where the nearest drain and circuit are. You get an itemized written price with a model number on it.
Sized by square footage, ceiling height and how wet the space actually is — not by whatever's on the shelf. A unit that's too small runs forever; too big short-cycles and dies early.
Our licensed electricians run a dedicated circuit and outlet where it's needed. No extension cords, no sharing the circuit with the freezer.
Unit hung from the joists on isolation hangers so it's quiet and your floor stays clear. Ducted to return and supply where one unit serves two spaces.
Hard-piped by gravity to a sump, floor drain or outside — or a condensate pump with the line run properly and secured. This is the part people cheap out on and then flood.
Humidistat set, and we come back or check remotely to confirm the space is actually holding 45 to 55 percent. You get the reading, not a promise.
A whole-basement unit draws roughly 5 to 8 amps when the compressor is running, and in a properly sealed space it only runs part of the time. Most New Jersey homeowners see something in the range of a few dollars a week in the humid months and nearly nothing from November to March.
The cheapest thing you can do for the running cost has nothing to do with the machine: seal the sump lid, extend the downspouts, close the crawl vents and insulate the rim joist. Every gallon that doesn't get into the air is a gallon the compressor doesn't have to pull back out.
Paramus-based, installing basement and crawl space dehumidifiers across all 21 New Jersey counties, with the electrical and the drain done in-house. If you've got a unit somebody else hung and it's icing up or dumping on the floor, we service those too. Send a hygrometer reading and a photo of the space to info@firstcallcontractingnj.com and we'll tell you what size you need.
typical fixed-price range — your exact number goes in writing after a free visit
How we beat the big chains: The waterproofing chains bundle a dehumidifier into a $20,000 system at a number nobody can itemize. Ours is a line item with a model number, a pints-per-day rating and the electrical spelled out — buy it on its own if that's all you need. No franchise fees, no commissioned salesmen, no rented subcontractors — that's typically 15–30% under national-brand quotes for the same or better spec. Bring us any written quote and we'll match the scope line by line.
“They sold me a dehumidifier and never mentioned the downspout washing straight into the window well.”
“The drain hose was just draped toward the floor drain. It kinked and put ten gallons on my finished floor.”
“The crawl space unit runs 24 hours a day and the space is still damp and smells.”
You found a crew that is actually near you. First Call Contracting is based in Paramus, in Bergen County, and our own licensed techs handle basement dehumidifiers in all 21 New Jersey counties — no call center, no subcontractor sent from two states away. Most of Bergen, Passaic, Hudson and Essex is 15 to 30 minutes from our shop, and emergencies go to the nearest crew, 24/7.
Closest to us: Bergen CountyPassaic CountyHudson CountyEssex CountyMorris CountyUnion CountyAll 21 counties & 219+ towns →
Call (201) 676-3099, text us a photo, or book a free in-home estimate — you get a written price before any work starts.
About $1,800 to $3,800 for a whole-basement unit with a condensate pump or hard-piped drain, and $2,800 to $5,500 for a ducted unit serving a basement and crawl space together. A dedicated circuit, if you need one, is priced on its own line. Crawl space encapsulation is a separate scope we'll quote alongside it.
45 to 55 percent relative humidity, year round. Above 60 percent mold grows on joists, boxes and the back of drywall — that's the musty smell. Below 40 percent you're just paying for electricity and drying out wood trim. Buy a $15 hygrometer and leave it on a shelf down there; it's the most useful tool in the basement.
Because its pint rating is measured at 80°F and your basement is in the low 60s, so it pulls far less than the box claims. Add a two-gallon bucket that fills overnight in July, a coil that ices in cool air, and a one-year warranty, and most of them are dead in two or three seasons. A whole-basement unit is rated for basement conditions, drains itself and carries a five-year warranty.
No. It fixes humid air. If water is actually entering — through the cove joint, a crack, a window well or the floor — you need drainage, a sump, crack repair or exterior work, and the dehumidifier is what you add after. We'll tell you which problem you actually have before quoting a machine.
Usually both, in that order: encapsulation first, dehumidifier second. A sealed liner and closed vents stop the moisture coming out of the dirt and in through the vents; the dehumidifier handles what's left. A dehumidifier alone in an open, dirt-floored crawl runs constantly and still loses.
Roughly 5 to 8 amps while the compressor runs, and in a sealed space it only runs part of the time — a few dollars a week in the humid months and close to nothing in winter. Sealing the sump lid, extending downspouts and insulating the rim joist cuts the run time more than any setting on the unit.
If you're anywhere in New Jersey, yes. First Call Contracting is based in Paramus and handles basement dehumidifiers across all 21 counties with our own licensed crew. Most of Bergen, Passaic, Hudson and Essex is 15 to 30 minutes from our shop, and emergencies are dispatched to the nearest crew 24/7. Call (201) 676-3099 or book a free in-home estimate.
Sized for a basement · hung off the joists · drained for real
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A real person picks up every hour of every day. We tell you what to shut off first, then send the nearest crew.