Ducted whole-home dehumidifiers for sticky New Orleans houses
If the thermostat says 72 and the house still feels damp, the AC is doing its cooling job and missing the humidity. A ducted dehumidifier fixes that without over-cooling the house.
Answered 24/7Mid-City service officeSlidell head officeEvery major brand
A whole-home dehumidifier in New Orleans ties into the existing ductwork and removes moisture the AC leaves behind, holding indoor humidity near 45 to 50 percent. It runs independently of cooling, so it keeps working in spring and fall when the AC barely cycles, and it drains to the condensate line with no bucket to empty.
Why a working AC can still leave the house damp
Updated September 2026
An air conditioner removes moisture only while it runs and only as a side effect of cooling. In mild weather it barely runs, and an oversized system shuts off before it has pulled much water out. The result is a house that is cool, clammy and slow to dry after rain.
A ducted dehumidifier is built to remove moisture first. It pulls air from the house, dries it, and returns it through the ducts, controlled by its own humidistat rather than the thermostat.
What moves the cost of a whole-home dehumidifier
We price these after seeing where the unit can go and how the ducts are laid out.
Capacity
Pints-per-day sizing follows the house and its air leakage.
Location
Attic, closet or crawl space affects mounting and drainage.
Duct connections
Tying into return and supply takes more work on some systems.
Drain path
A nearby condensate line is simple; a long run or pump adds cost.
Controls
A separate humidistat or integration with the thermostat.
Crawl space prep
Vapor barrier repair where the unit serves the crawl space.
What comes with every dehumidifier install
- Humidity readings before and after
- Capacity sized to the house
- Ducted connection with backdraft dampers
- Condensate drain tied in
- Dedicated humidistat set near 45 to 50 percent
- AC fan and thermostat settings adjusted
- Filter location shown
Three ways to deal with indoor humidity
| Portable dehumidifier | AC dehumidify mode | Ducted whole-home unit | |
|---|---|---|---|
| Coverage | One room | Whole house, while cooling | Whole house, any time |
| Works in mild weather | Yes | No | Yes |
| Drainage | Bucket or hose | AC drain | AC drain |
| Noise | In the room | None extra | Out of sight |
Ducted Dehumidifier
This is the whole-house option: a dedicated unit mounted in the attic, closet or crawl space beside the air handler and tied into the return and supply ducts. It removes far more water per day than portable units and drains straight into the condensate line. We size it to the house and to how tight or leaky the building is, set the humidistat, and make sure it cannot fight the AC. Installation is usually one day, and we take humidity readings before and after so you can see the difference in numbers, not just feel it.
Crawl Space Dehumidifier
Raised homes breathe through their crawl spaces, and damp air under the floor finds its way up through gaps in the old boards. A dehumidifier in an encapsulated or partly sealed crawl space keeps that air dry, which protects the framing and cuts the musty smell upstairs. We look at the vapor barrier and any standing water first, because a dehumidifier cannot keep up with a crawl space that floods every heavy rain. In that case the drainage gets fixed first and the dehumidifier sized after.
Humidity Control Settings
Getting the setup right matters as much as the equipment. We set the humidistat around 45 to 50 percent, switch the AC fan to auto, and where the thermostat supports it enable dehumidify-on-cool so the blower slows down and the coil pulls more water. Set too low, a dehumidifier runs constantly and wastes power; set too high, it does little. We show you where the control is and what to change seasonally, since spring and fall need different settings than August.
Old houses and humid air
Pre-1940 homes in the Garden District and Mid-City were built to breathe, with tall ceilings and big windows, not to hold conditioned air. Adding central AC to a house like that cools it without making it dry, because humid air keeps finding its way in. With about 60 inches of rain a year, a ducted dehumidifier is often what finally lets an old house feel comfortable at a reasonable thermostat setting.
Brands we service and install
We repair and install Trane, Carrier, Lennox, Goodman, Rheem, Ruud and the other major lines, plus Mitsubishi Electric ductless.
How a dehumidifier installation runs
- 1
Humidity readings
We measure indoor humidity and look for the moisture sources.
- 2
Sizing and location
Capacity chosen and the mounting spot agreed.
- 3
Mount and duct
Unit set, ducted to return and supply with dampers.
- 4
Drain and power
Condensate tied in, circuit and controls wired.
- 5
Settings
Humidistat set, AC fan and thermostat adjusted.
- 6
Follow-up reading
Humidity checked after the system has run.
Questions about Whole-Home Dehumidifier Installation in New Orleans
Around 45 to 50 percent is comfortable and discourages mold without over-drying.
Some thermostats slow the blower to remove more moisture, which helps, but it only works while the AC is cooling.
Slightly, because the process adds a little heat. With the AC running, you will not notice it.
It removes far more water, runs quietly out of sight and drains itself. No bucket to empty.
Usually, yes, when the smell comes from high humidity. A smell from a mold source needs that source fixed.
In the attic, a closet or the crawl space, near the air handler and a drain.
Aprilaire and dehumidifiers matched to Honeywell, Trane, Carrier and Lennox systems.
Often it is the most practical fix short of replacing the AC, because it removes moisture the short-cycling system cannot.
More air quality & humidity we handle in New Orleans
Bath & Kitchen Exhaust Fan Installation
Bathroom exhaust fans, kitchen range hood venting and more.
Our bath & kitchen exhaust fan installation serviceEvaporator Coil Cleaning
Mold and mildew on the coil, musty ac smell and more.
Evaporator Coil Cleaning in New OrleansHouse cool but still clammy?
Call and we will measure the humidity and tell you what will fix it.
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