Mold needs three things: food (your joists), the right temperature (your crawl space), and humidity above 60%. You can't remove the food or meaningfully change the temperature — but you can own the humidity. In the Tennessee Valley, where outdoor relative humidity routinely sits above 70% from May through September, a sealed crawl space still needs active drying to stay under the 55% threshold where mold simply cannot grow.
We install commercial-grade dehumidifiers rated 70–90 pints per day — not the hardware-store portables that die in eighteen months and fill a bucket you have to empty. Our units drain automatically to the sump or a condensate line, sense humidity continuously, and are sized to your crawl space's actual cubic footage and leakage rate. Every installation includes a remote humidity monitor you can read from inside your house, so 'is it still dry down there?' is a glance, not a guess. Paired with a sealed barrier, a properly sized dehumidifier is what turns a one-time fix into a permanent one.
Moisture readings, photos, and a written report — no obligation.
The free inspection tells you exactly what's going on — with photos and moisture readings, not a sales pitch.
Portable units aren't built for crawl space conditions — they're undersized, need manual emptying, and typically fail within a couple of years in continuous damp operation. Commercial units move 2–3x the moisture, drain automatically, and are rated for years of continuous duty.
Units drain automatically to your sump basin or a dedicated condensate line — no buckets, no babysitting.
Under 55% relative humidity is the target — below that threshold mold cannot grow. We also check wood moisture content; joists should read under 19%.
In our climate, almost always yes. Encapsulation stops ground moisture; the dehumidifier controls what little ambient moisture remains and guarantees the space stays under 55% year-round.