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 sizing on a Davidson job is one of the few places where the two-era split in this town actually forces different equipment on the truck. Pre-1900 core houses need bigger units than their square footage would suggest — the historic envelope leaks in ways a modern block-perimeter crawl does not — and I have watched contractors from Charlotte size Davidson historic jobs off a standard cubic-footage worksheet and end up with an Aprilaire E070 running 24/7 in July trying to hold 55 percent RH in a crawl it was never sized for. Two years later the compressor is done and the homeowner is calling me to redo it. I default to an Aprilaire E080 or Santa Fe Compact 70 on a pre-1900 Davidson core crawl of 1,000 to 1,500 SF where a Charlotte franchise would drop an E070. The upcharge is small. The extra capacity is the difference between a unit that runs a proper duty cycle and holds set point through an August week and a unit that runs continuously, ices up its coil, and burns out inside five years.
Modern-Davidson jobs are standard. A 1998 Davidson Village crawl of 1,500 SF gets an Aprilaire E070 or Santa Fe Compact 70 sized to the cubic footage — same equipment, same install, same performance you would expect in a Ballantyne or Cornelius newer-construction crawl. A larger River Run house of 2,500 to 3,500 SF gets an Aprilaire E100 or Santa Fe Ultra98 depending on whether there is any active water history. St. Alban's Square houses are usually mid-range 1,800 to 2,200 SF and take an Aprilaire E080 comfortably. All of these run on their own 20-amp circuit, drain to daylight where slope allows, condensate pump if daylight is not accessible. Mecklenburg electrical permit for the dedicated circuit — I pull it because if the dehumidifier shares a circuit with the crawl light or the sump pump and something trips at 2 a.m. in July, you wake up to a swamp.
The Davidson-specific install wrinkle is condensate discharge routing on any house inside the Davidson Historic District Commission overlay. HDC reviews exterior visible modifications, including a dehumidifier condensate line that exits the foundation wall in a location visible from the street. On a pre-1900 core house on Concord Rd, Main St, or Griffith St, I default to routing the condensate to the rear elevation or a non-visible side to keep the HDC submission simple. If the geometry forces something visible, I submit with a paint-to-match spec on the discharge cover and standard turnaround is two to three weeks. On Davidson Village, River Run, and St. Alban's Square houses the HDC review is not triggered — those neighborhoods are outside the overlay. Free on-site inspection everywhere in Davidson, fixed written quote, dehumidifier sized to the actual envelope of your specific house rather than a spreadsheet.
Install sequence on a pre-1900 core dehumidifier goes in as the final step of a full encapsulation, not standalone. There is no scenario where dropping a dehumidifier into a pre-1900 crawl without addressing the vapor barrier, pier wraps, and wall termination first accomplishes anything meaningful — the unit will run continuously fighting the ground-moisture and envelope-leak load, ice up its coil, and burn out inside a few years. When the encapsulation is done properly and the crawl is sealed, the dehumidifier install itself is straightforward: mount the unit on a wall bracket or condensate stand above the flood plane, wire to a dedicated 20-amp circuit run from the electrical panel (Mecklenburg electrical permit — I pull it), plumb the condensate discharge to daylight at the rear or non-visible side elevation, set the humidistat to 55 percent RH, and verify airflow with a manometer on the return and supply ports. On a pre-1900 core install, unit placement has to work around the historic pier layout — sometimes the wall-mount bracket has to go on a girder rather than a perimeter wall because the perimeter has no continuous surface to mount to.
Modern-Davidson install runs the standard sequence. Aprilaire or Santa Fe unit mounted on a wall bracket, dedicated 20-amp circuit, condensate to daylight or condensate pump if daylight is not accessible, humidistat set to 55 percent RH. On Davidson Village and River Run houses with tight alley-served lots, condensate discharge routing has to consider neighbor lot lines — I default to discharging into the rear yard or a landscape bed rather than onto the alley or a neighbor's driveway. Sensible on any tight-lot neighborhood but especially on Davidson Village where the new-urbanist streetscape matters and neighbors are five feet away.
Historic District Commission submission for exterior condensate discharge on pre-1900 core houses inside the overlay is a two-to-three-week turnaround. I submit as part of scope with the exterior discharge location, photos of the proposed termination against the historic elevation, and a paint-to-match spec on the discharge cover. Standard practice is to route to the rear or a non-visible side elevation and avoid the HDC submission altogether where the house geometry allows — on a corner-lot house that faces two streets, the visible-elevation constraint is tighter and sometimes the submission is unavoidable. In fifteen years of Davidson historic-core work I have never had a dehumidifier condensate submission denied.
Unit spec on pre-1900 Davidson historic-core jobs runs one notch up from what the cubic footage alone would suggest. A 1,000 to 1,500 SF pre-1900 crawl gets an Aprilaire E080 (70 pints per day at AHAM conditions, higher pull at Charlotte summer dew points) or Santa Fe Compact 70. A 1,500 to 2,000 SF crawl gets an Aprilaire E100 or Santa Fe Ultra98 — the historic envelope on the larger footprints leaks proportionally more and the capacity headroom matters through an August week when outdoor dew points sit in the low 70s. On any pre-1900 core install with active water history or ongoing seepage, I spec the AlorAir Sentinel HDi90 as an alternative — the HDi90 has better duty-cycle performance under high moisture load than the standard Aprilaire units and holds up longer in the humid pre-1900 crawl environment.
Modern-Davidson spec is standard. Davidson Village 1998 crawl of 1,500 SF: Aprilaire E070 or Santa Fe Compact 70. River Run 2000s house of 2,500 SF: Aprilaire E080 or Santa Fe Ultra70. Larger River Run or St. Alban's Square houses of 3,000-plus SF: Aprilaire E100 or Santa Fe Ultra98. All units on a dedicated 20-amp circuit run from the electrical panel with a Mecklenburg electrical permit, condensate discharge in 3/4-inch PVC to daylight at the rear or non-visible side elevation, condensate pump (Little Giant VCMA-15UL is my standard) if daylight is not accessible. Humidistat set to 55 percent RH on install and I check it back at the six-month mark on the first year to verify the unit is holding set point cleanly.
Yes — Davidson is a regular dehumidifier route. Free on-site inspection anywhere in Davidson, fixed written quote before we touch anything.
Davidson dehumidifier sizing runs one notch bigger on pre-1900 historic-core houses because the leaky historic envelope pulls in outdoor humidity through every gap in the original brick skirt — an Aprilaire E080 or Santa Fe Compact 70 where a modern crawl of the same footprint would take an E070 — and condensate line routing on any historic-core house triggers Davidson Historic District Commission review if the discharge is visible from the street.
28036. All Mecklenburg County addresses covered.
The historic envelope leaks. Pre-1900 construction in the Davidson core has no continuous perimeter foundation wall — usually a low brick skirt added in the 1920s or 1930s to close in the space between the original stone piers, and that skirt is not sealed to the framing above. Outdoor humidity finds every gap. Even after we terminate the liner and seal every visible gap we can reach during encapsulation, the historic envelope pulls in more moist air than a 1998 Cornelius or Davidson Village block-perimeter crawl of identical square footage. That is why I spec an Aprilaire E080 or Santa Fe Compact 70 on a 1,200 SF pre-1900 historic-core crawl instead of the E070 I would drop on a comparable-footprint 1998 crawl. The dehumidifier has more work to do and it needs the capacity to hold 55 percent RH through an August week when outdoor dew points sit in the low 70s and your envelope is 130 years old.
If your house is inside the Davidson HDC overlay — roughly the blocks around Main St, Concord Rd, Griffith St, and the Davidson College campus — and the condensate discharge exits the foundation in a location visible from the street, yes. I default to routing condensate to the rear elevation or a non-visible side to keep the submission simple, and in most cases the routing avoids the HDC review entirely. If the house geometry forces a visible discharge — a corner lot facing two streets, for example — I submit as part of scope with photos of the proposed discharge location and a paint-to-match spec on the cover. Two-to-three-week turnaround. In fifteen years I have never had a dehumidifier condensate submission denied. Davidson Village, River Run, and St. Alban's Square are outside the overlay — no HDC review needed on those jobs.
No, and I have crawled under Davidson houses where the homeowner tried exactly that. A portable LG or Frigidaire 50-pint unit is rated for AHAM conditions — 80 degrees, 60 percent RH. Charlotte crawlspaces run 90-plus percent RH from May through October at temperatures the portable was not designed for, so the portable ices up its coil, runs continuously, and burns out inside a summer or two. It also has no drain — you empty the reservoir manually, which nobody does when it is in a crawl. And it has no humidistat control, so it runs whenever it is plugged in regardless of actual RH. A real crawlspace dehumidifier (Aprilaire E070/E080/E100, Santa Fe Compact 70/Ultra98, AlorAir Sentinel HDi90) is rated for high-humidity high-temperature crawl conditions, drains continuously to daylight or through a condensate pump, and holds set point via a proper humidistat. Different equipment, different job. Portables belong in basements at grade, not in crawls.
Filter change annually — the Aprilaire filters are about the price of a good dinner, the Santa Fe filters are similar, both are widely available. Coil cleaning every three to five years depending on how much construction dust or organic debris ended up in the crawl during the initial install. Compressor lifespan on a properly sized unit that is not running continuously is 8 to 12 years — units that run 24/7 fighting an oversized moisture load burn out much faster, which is why sizing matters more than brand. On a well-designed Davidson install (properly sized unit, sealed crawl, dedicated circuit, condensate draining cleanly) I typically see 10-plus years on the compressor with just the annual filter change. On a Davidson historic-core install with the sized-up unit, I recommend checking the humidistat setting at the six-month mark on the first year to verify the unit is holding 55 percent RH cleanly and not running excessive duty cycles.
Free on-site Davidson inspection. Fixed written quote. Call (980) 227-1769 or book below.