Commercial Dehumidifier — Portable and Ceiling-Mounted Units from a Chinese Manufacturer

For a standard 100 m² commercial basement with a 2.8–3.0 m ceiling and normal infiltration, the GDH-58E (58 L/day) or GDH-90E (90 L/day) is the typical specification. Choose GDH-58E if the basement is dry-sealed with low moisture infiltration; choose GDH-90E if there are foundation moisture issues, frequent door openings to outside, or internal moisture sources (laundry, water utility). For ducted installation through HVAC, GDH-CE56 or GDH-CE90 from our ceiling-mounted line is the equivalent.

Yes. Crawl space dehumidifier installation is a major application for our portable GDH series — GDH-50E or GDH-58E handles encapsulated crawl spaces up to about 100 m². For installation in a non-encapsulated crawl space (no 6-mil vapor barrier on the ground), size up by one model because moisture infiltration from the soil will be continuous. Direct the unit's drain hose to a sump pump or exterior gravity drain — do not leave condensate to accumulate in the crawl space.

Three differences: (1) Duty cycle — commercial units run continuously through the moisture season; residential cycle on/off through the day; (2) Power — commercial uses 220V single-phase (in some markets 110V/60Hz for OEM); residential uses standard household 110V/240V at lower current draw; (3) Drainage — commercial offers continuous drain hose connection for unattended operation; residential uses a tank you empty. SHISHUO commercial units are built for the first specification — continuous duty with continuous drainage.

Our catalog publishes capacity in L/day at 30°C / 80% RH test conditions, which is a warmer and more humid condition than the AHAM standard (80°F / 60% RH = 26.7°C / 60% RH) used by most North American brands. To convert: multiply our L/day figure by approximately 0.62 to get the equivalent AHAM L/day, then by 2.11 to get PPD. For example, GDH-60E rated 60 L/day in our catalog corresponds to about 37 L/day or 78 PPD at AHAM conditions. Under the cooler DOE 2019 standard (65°F / 60% RH), the figure drops further to about 23 L/day. We publish both numbers in our product matrix tables so you can compare directly with AHAM-rated competitors. This temperature-dependence applies to all compressor refrigerant dehumidifiers — not just ours.

Yes. SHISHUO is a manufacturer of commercial dehumidifiers, not a trading company. We support OEM (your branding, packaging, manual on our standard hardware) and ODM (modified hardware to your specification). The OEM/ODM process follows our standard 6-step flow: requirement analysis, solution and model selection, specification confirmation, production and assembly, testing and 100% final inspection, packaging and shipping. Voltage, refrigerant, color, controls, and packaging are all adjustable at the project level.

Three refrigerants are used across the range, depending on model and market: R290 (propane, low GWP, preferred for EU), R134a (used in some lower-capacity models), and R32 (newer EU and Asia-Pacific standard). For OEM projects to specific markets, we can specify the refrigerant to match local regulation.

All compressor refrigerant commercial dehumidifiers in the GDH and GDH-CE range operate between 5°C and 38°C ambient. Below 5°C, the evaporator coil cannot stay above frost point even with automatic defrost, so capacity falls off sharply. If you need extraction below 5°C — cold storage rooms, unheated winter garages, refrigerated logistics — choose a desiccant unit from our ROD series instead, which extracts moisture by adsorption rather than condensation and is not temperature-limited the same way.

Our GDH-CE ceiling-mounted models are designed for concealed overhead or in-plenum installation, ducted to the conditioned space. They are not designed for wall surface mounting in the way some North American residential dehumidifiers are configured. If your project requires wall-mounted dehumidifier installation specifically (for example, a slim profile mounted to a wall in a corridor), discuss this with us at the inquiry stage — wall-mounted enclosures can be designed under ODM.

Yes. Our DS-HS series is a humidifier + dehumidifier combo unit with integrated air filtration (activated carbon and ion sterilization). It serves applications that need bidirectional humidity control — archives, data rooms, GMP cleanrooms, museums, precision electronics manufacturing. Capacity range covers humidification 98–480 L/day and dehumidification 72–300 L/day. See our temperature and humidity control page for full specifications.