The last piece of a proper encapsulated crawlspace. We size the unit to your cubic footage (not by guess), plumb the condensate line to daylight or a sump, and dial in the humidistat so your crawlspace holds a steady 50-55% RH year-round.
A licensed local crew — usually out in 24 to 72 hours. Written scope, fixed price, no pressure.
Dehumidifier installs are the single most impactful thing I do under a Ballantyne house, and they are also the one item that separates a real encapsulation from a marketing sticker. In this ZIP the moisture math is uncomplicated: from May through October the outdoor dew point sits in the low 70s, ground moisture off-gasses through the CMU piers and block walls, and any crawl in the 1992-to-2010 tract-and-custom belt will hold 70 to 85 percent RH without mechanical dehumidification, regardless of how good the vapor barrier is or how well the vents are sealed. That is not a defect. It is physics. The only way to hold 55 percent RH in a Charlotte crawl through August is a properly sized dehumidifier on a dedicated circuit, running continuously with a real drain.
Two weeks ago I was under a 2008 custom on Ardrey Kell Rd in the Ardrey Kell High School district, 5,600 SF two-story on a half-acre lot. The homeowner called because his July utility bill was 40 percent higher than the previous summer and the HVAC contractor could not find anything wrong with the equipment. Under the house I found what I call the Ballantyne 2000s custom trap: a builder-attempted partial encapsulation from 2008 with 10-mil plastic on the ground, four pier wraps out of 26 total, tape stuck to dusty block on the walls that had walked off years ago, no dehumidifier, six vents left half-open. Hygrometer read 82 percent RH at 78 degrees. His HVAC was running longer because it was dehumidifying the crawlspace through every leaky return joint, not cooling the house. The dehumidifier install alone — an AlorAir Sentinel HDi90 sized for the 2,400 SF crawl footprint on a dedicated 20-amp circuit, drained to a condensate pump through the east wall — brought his RH to 55 percent within 48 hours of startup and his August utility bill came back in line with the pre-encapsulation baseline the following summer.
The Ballantyne dehumidifier conversation is not about whether — it is about which one and how it is drained and permitted. Sizing is by cubic footage of the crawl, not square footage, because a 44-inch clearance Ardrey Kell custom has 30 percent more air volume than a 34-inch clearance Ballantyne Corporate Park townhome with the same footprint. Drainage is by lot geometry — daylight where slope allows, condensate pump where it does not. Electrical is by code — dedicated 20-amp circuit through a Mecklenburg permit, no exceptions. HOA is by neighborhood — Piper Glen wants notification for any exterior condensate line, Providence Country Club wants a landscape screen on any golf-facing elevation, Ballantyne Country Club does not care about interior mechanical work. All of that gets handled as part of the scope.
The mistake I see other contractors making constantly in Ballantyne is undersizing. A 1,500-SF residential portable dehumidifier from a big-box store, tossed on the crawl floor with a garden hose to the sump pit, is not a solution. Those units are designed for 1,500-SF basements at 65 percent RH — not 2,400-SF crawls at 80 percent RH with active ground moisture load. They cycle constantly, burn out in 18 months, and never hold the target RH. What actually works is a purpose-built crawlspace unit rated for 90 to 100 pints per day at AHAM conditions, ducted where necessary, on a real electrical circuit. Aprilaire, Santa Fe, and AlorAir all make units that meet that spec. Anything else is a Band-Aid.
Every Ballantyne dehumidifier install starts with sizing based on actual cubic footage, not the shortcut of square feet from the assessor record. On the inspection I measure the crawl footprint (typically 2,000 to 3,500 SF depending on the era), measure the average clearance height (usually 36 to 48 inches), calculate cubic feet, and add a load factor based on existing moisture conditions. A tight, well-sealed encapsulation on a 3,000 SF Piper Glen tract home with 40-inch clearance and no active water is roughly 10,000 cubic feet — that is Aprilaire E080 or Santa Fe Compact 70 territory. A leaky partial encapsulation on a 5,000 SF Ardrey Kell custom with 46-inch clearance and 82 percent starting RH is closer to 20,000 cubic feet at a higher load — that is Aprilaire E100, Santa Fe Ultra98, or AlorAir Sentinel HDi90 territory. Getting the sizing right on the first install is what separates a unit that holds 55 percent RH through August from one that runs constantly and never catches up.
Second, drain design. Ballantyne lots typically have enough grade drop from the foundation to a lower point on the property that we can drain the dehumidifier to daylight — 3/4-inch schedule 40 PVC exiting the crawl through the block wall, running underground to a daylighting point at a lower elevation. On flatter lots or where the discharge point would land in a hardscape area, we install a condensate pump — Aprilaire Model 5000 or Little Giant VCMA-15ULS — that lifts the condensate up and over the foundation to a discharge point at grade. Piper Glen HOA wants notification for any exterior condensate line and Providence Country Club wants a landscape screen on golf-facing elevations. We route to their standards and submit before we cut through the foundation.
Third, electrical. Dehumidifier goes on its own dedicated 20-amp circuit — no exceptions. That is a Mecklenburg electrical permit and we pull it, because if the dehumidifier shares a circuit with the crawl light and something trips at 2 a.m. in July, you wake up to a swamp. Circuit runs from the main panel to a J-box mounted on a crawl wall or pier near the dehumidifier, terminated in a duplex GFCI outlet. On the 2007-plus custom stock along Elm Ln and the Ardrey Kell district, some houses have a dedicated crawl subpanel from the original build — those are convenient because the circuit can land there instead of the main panel — but most 1990s and early 2000s tract homes do not, and the circuit runs the full distance from the main panel.
Fourth, humidistat setpoint and commissioning. Discharge humidistat set to 55 percent RH — the industry standard for a conditioned crawlspace per NC Residential Code N1102.2.11. On startup the unit will run continuously for the first 48 to 72 hours to pull the crawl down from its starting RH (usually 75 to 85 percent) to the 55 percent target. After that it cycles as needed, running roughly 4 to 8 hours per day through summer and less through winter. First-year maintenance is a filter change at the 6-month mark and a coil cleaning at 12 months. I include a hygrometer with WiFi monitoring on every install so the homeowner can watch RH from a phone and know immediately if the unit stops working.
Fifth, HOA and permit closeout. For Piper Glen, we submit the exterior condensate line routing to the HOA architectural committee with a photo of the painted PVC (matched to the trim color) after the install is complete. For Providence Country Club, we submit the landscape screen design and photograph the completed screen. Mecklenburg electrical inspection happens 3 to 5 business days after install request, and the inspector wants to see the dedicated circuit terminated properly at both ends and the dehumidifier properly grounded. Passing inspection closes the permit and the project.
Sizing tier one — small Ballantyne crawls, typically Ballantyne Corporate Park townhomes along Johnston Rd with 24-to-30-inch clearance and 1,500 to 2,000 SF footprint — Aprilaire E070 (70 pints per day at AHAM) or Santa Fe Compact 70 (70 pints per day). Both units draw approximately 5.4 amps at 115V, well within a 20-amp dedicated circuit budget. Both include a MERV-11 filter and a condensate pump connection port for lifted discharge applications.
Sizing tier two — standard Piper Glen, Ballantyne Country Club, and Providence Plantation tract homes with 36-to-42-inch clearance and 2,500 to 3,500 SF footprint — Aprilaire E080 (80 pints per day) or Santa Fe Compact 70 upsized to Advance 90 (90 pints per day). This is the workhorse tier for the ZIP and covers about 60 percent of the installs I do. Both units are freestanding, corrosion-resistant cabinet, MERV-11 filtration, integrated humidistat with 45 to 65 percent RH setpoint range.
Sizing tier three — 2000s custom stock along Rea Rd, Ardrey Kell Rd, and the Ardrey Kell High School district interior lots with 44-to-48-inch clearance and 4,000-to-6,500 SF footprint — Aprilaire E100 (100 pints per day), Santa Fe Ultra98 (98 pints per day), or AlorAir Sentinel HDi90 (90 pints per day at higher SEER rating). The AlorAir Sentinel HDi90 is the unit I have specced most often on the larger custom homes over the past three years because its higher energy factor holds down operating costs meaningfully across a full cooling season. All three tier-three units draw approximately 7 to 8 amps at 115V and require a dedicated 20-amp circuit.
Condensate pump for lifted discharge is Aprilaire Model 5000 or Little Giant VCMA-15ULS — both are 1/50 HP centrifugal pumps rated for 15 feet of lift at 3.5 gallons per minute, plenty for a Ballantyne crawl-to-grade application. Pump plugs into the same GFCI outlet as the dehumidifier and includes a safety switch that kills the dehumidifier if the pump fails to keep up with condensate flow. Discharge line from the pump is 3/8-inch PEX or 1/2-inch schedule 40 PVC exiting the crawl through the block wall and routed per HOA requirements — subgrade daylighting where lot slope permits and HOA allows, above-grade splash block otherwise.
WiFi monitoring is a SensorPush HT.w hygrometer/thermometer with the SensorPush G1 WiFi gateway, mounted at a representative crawl location and sending RH and temperature readings to the homeowner's phone every 30 minutes. Alert thresholds set to 65 percent RH high and 40 percent low — either alert triggers a homeowner check on the dehumidifier operation. Alternate monitoring is the Aprilaire 8620 wall-mount panel for homeowners who prefer a physical readout inside the house rather than a phone app.
Yes — Ballantyne is a regular dehumidifier route. Free on-site inspection anywhere in Ballantyne, fixed written quote before we touch anything.
Ballantyne dehumidifier sizing is driven by the taller-than-average 36-to-48-inch crawl clearance across the ZIP — the same 3,000 SF footprint in Piper Glen has significantly more cubic-foot air volume than a comparable footprint in older Charlotte stock, which pushes sizing up one tier in most cases, and the master-planned neighborhoods' HOA requirements (Piper Glen notification, Providence Country Club landscape screening) shape the exterior condensate discharge routing before the unit is even specced.
28277, 28270. All Mecklenburg County addresses covered.
Yes, and this is the single most important thing to understand about crawlspaces in Charlotte's climate. A properly installed 20-mil vapor barrier eliminates ground-source moisture evaporation into the crawl air. Sealed vents eliminate the outdoor-air moisture load that flows through the openings from May to October. Both are necessary. But even with both in place, an encapsulated Ballantyne crawl will still hold 70 to 75 percent RH from June through September without mechanical dehumidification, because ground moisture continues to off-gas through the CMU piers and block walls faster than any passive system can remove it. The only way to hold 55 percent RH — the NC Res Code N1102.2.11 target for a conditioned crawlspace — is a dehumidifier running on a real electrical circuit. Every 'encapsulation' I tear out and redo in this ZIP that was done by a builder or a fast-flip franchise skipped the dehumidifier, and every one of those crawls was running the same 75-plus percent RH as its unencapsulated neighbors. Vapor barrier plus vents plus dehumidifier is the system. Any two of the three is a partial job.
I do not quote operating costs in dollar figures — every homeowner's Duke Energy rate is slightly different and the load varies by crawl size — but I can tell you the pattern. A properly sized dehumidifier in a properly sealed Ballantyne crawl runs continuously for the first 48 to 72 hours after install to pull RH from the 75-to-85 percent starting point down to the 55 percent target. After that it cycles as needed — typically 4 to 8 hours per day from June through September, less in the shoulder months of May and October, and only occasionally through winter. The bigger unit runs less in absolute hours than an undersized unit would because it can catch up to the load quickly and shut off. Across a full cooling season, the AlorAir Sentinel HDi90 in tier three is the most energy-efficient of the units I spec — it holds down operating costs meaningfully compared to older-generation dehumidifiers with the same removal capacity.
Yes, with notification. Piper Glen wants a heads-up on any exterior mechanical line, and in practice they wave through anything that exits the foundation on a side or rear elevation with the PVC painted to match the trim color. I have never had a Piper Glen submission kicked back for a properly routed condensate line. The problem cases are when a previous contractor ran the discharge to a front elevation or left the pipe unpainted and glaring white against dark trim — those get letters. We route to side or rear as default and paint the exposed pipe as part of the scope. If the lot geometry forces a visible run, we default to an interior condensate pump discharging into an existing plumbing stack instead — no visible exterior line at all. There is always a solution. Providence Country Club is stricter — any exterior equipment or discharge visible from a fairway needs a landscape screen, which we design in and submit.
For the specific units builders in this ZIP were installing in the mid-to-late 2000s, yes, and that is why we do not spec those units anymore. Builder-installed dehumidifiers in Ballantyne 2000s custom construction were typically 1,500-SF residential portables from a big-box source, tossed on the crawl floor with a garden hose running to the sump pit or to daylight through the vent. Those units are designed for 1,500-SF basements at 65 percent RH, not 2,400-SF crawls at 80 percent RH with active ground moisture load. They cycled constantly, burned out compressors in 18 to 30 months, and never held the target RH in the first place. What actually works is a purpose-built crawlspace unit — Aprilaire E100, Santa Fe Ultra98, or AlorAir Sentinel HDi90 — with a corrosion-resistant cabinet, MERV-11 filtration, integrated humidistat, on a dedicated 20-amp circuit with a real drain. Those units run 8 to 12 years on a reasonable maintenance schedule and hold 55 percent RH through August. When we replace a failed builder unit we usually find that the crawl needs a full encapsulation retrofit anyway, because the vapor barrier and vent seals were installed to the same builder-partial standard as the dehumidifier.
Free on-site Ballantyne inspection. Fixed written quote. Call (980) 227-1769 or book below.