PSL Custom Wine Cellar handles wine cellar humidity control for collectors and businesses who have learned the hard way that cool air is only half the battle. Wine keeps best with relative humidity between 55% and 70%, and the air in Port St. Lucie rarely makes that easy.
Too much moisture breeds mold and peels labels, while air that is too dry shrinks corks and lets oxygen creep into the bottle. In plenty of local cellars, both problems show up in the same year as the seasons change.
A humidity visit usually covers:
Once the fix is in, every job wraps up with a 7-day humidity log, so you can see the numbers hold steady instead of taking anyone's word for it. Cellar owners from Port St. Lucie up through Roseland, Gifford and Wabasso count on that follow-through.
Request a Free Custom Wine Cellar
Voted #1 Custom Wine Cellar Builder on the Treasure Coast, 2026
These design concepts show how humidity problems look very different from one cellar to the next, from dripping glass to dried-out corks.

DESIGN CONCEPT · MARINER SANDS
The members' cellar at a Mariner Sands club had beads of water running down its glass every August and mildew creeping behind the racks. The concept adds a continuous vapor barrier on the warm side of the walls, swaps the old cooling unit for one with built-in humidity control and brings in a separate dehumidifier for the sticky summer months. Sensors now log humidity every few minutes, and the glass stays clear.
Estimated budget: $29,000
Estimated timeline: 4 to 5 weeks

DESIGN CONCEPT · BALLANTRAE
A Ballantrae collector noticed shrinking corks and a few weeping bottles, even though the room held 55°F like clockwork. A hygrometer showed humidity sitting near 40% because the cooling unit was pulling out too much moisture. The plan adds a ducted ultrasonic humidifier tied into the cooling system, plus a wall controller that holds the room at 60%.
Estimated budget: $6,800
Estimated timeline: 1 week

DESIGN CONCEPT · KINGS ISLE
This Kings Isle closet cellar smelled musty within a year because it was built without a vapor barrier. The concept strips the drywall, adds closed-cell spray foam and a sealed vapor retarder, then rebuilds the walls with moisture-resistant board before the original racks go back in. A small humidity controller and a new door sweep finish the job.
Estimated budget: $12,400
Estimated timeline: 2 to 3 weeks

01
Restaurant and club cellars take on humid air every time the door opens, which adds up fast on a busy night. Commercial setups pair a dedicated dehumidifier with remote alerts so a manager knows the moment levels slip.
02
A calibrated hygrometer and a few days of data logging show exactly what the room is doing between visits. Wireless sensors can stay in place afterward and send readings straight to your phone.


03
Dry cellars get a ducted or standalone humidifier, while damp ones get a dehumidifier sized to the room. Some Treasure Coast cellars need both, each running on its own controller.
04
Condensation forms wherever warm, humid air meets a cold surface like glass, ductwork or an uninsulated ceiling. Insulated glass, sealed duct runs and steady air movement keep those surfaces dry.


05
A vapor barrier on the warm side of the wall stops outside moisture from soaking into the room. Closed-cell foam adds insulation and a second line of defense in older cellars built without one.
06
A musty smell usually means moisture has been trapped behind the walls for a while. Damaged materials are removed and the cause is fixed before the space is rebuilt, so the smell does not come back.

Data before decisions:
Every visit starts with a calibrated humidity reading.
Fixes the cause, not the symptom:
Barriers, seals and equipment are corrected together.
7-day humidity log:
Proof the room is holding steady after the work is done.
Mold-safe materials:
Moisture-resistant board and sealed finishes are used throughout.
Adding a humidifier or dehumidifier with a controller usually runs about $2,500 to $7,000. Jobs that also need new insulation, a vapor barrier or a cooling upgrade cost more, which is why some of the projects above run higher.
Most installs take 1 to 3 days on site after a few days of data logging to see what the room is doing. Projects that include resealing the room usually run 2 to 3 weeks.
Depending on the room, that means a ducted humidifier, a dedicated dehumidifier or a WhisperKOOL or CellarPro cooling unit with built-in humidity control. A digital controller ties it together so the equipment works with the cooling rather than against it.
Yes. The equipment carries its manufacturer warranty, and the installation is backed by a 2-year workmanship warranty.
Humid summers push moisture into poorly sealed cellars, while drier winter air and hard-running AC can drop levels too low. A cellar here often needs help in both directions as the seasons change.