Quest Dual 110 Overhead Dehumidifier

The Quest Dual 110 Overhead Dehumidifier removes 110 pints of moisture per day and is designed to mount overhead, keeping your grow room floor clear for plants and equipment. It runs on standard 110–120V power, requires no hardwiring or installation, and includes an onboard dehumidistat for stand-alone humidity control. Optional condensate pump and ducting kits extend placement flexibility for spaces where drain access is limited.

Quest Dual 110 Overhead Dehumidifier Specifications

All specifications below are drawn from Quest’s published product data for the Dual 110 Overhead Dehumidifier.

Specification	Value
Water Removal Capacity	110 pints/day at 80°F, 60% RH
Energy Efficiency	Over 5.8 pints/kWh
Power Draw	7.4 amps
Voltage	110–120V
Height	19.4″
Width	14.5″
Length	26″
Weight	85 lbs
Control Type	Onboard dehumidistat
Filter	Replaceable MERV-8
Installation Type	Plug and play (no hardwiring required)
Placement Options	Overhead or ground level
Optional Accessories	Condensate pump kit, ducting kits
Country of Origin	Made in USA

Why Choose the Quest Dual 110 Overhead Dehumidifier

The Dual 110 was designed by Quest to fill a specific need: substantial moisture removal capacity in a form factor that mounts overhead and leaves floor space free. Here is what sets it apart from conventional floor-standing units:

• Overhead placement keeps floor space open. The unit was specifically engineered to mount overhead, keeping aisles and plant canopy areas free from bulky equipment. It can also be placed at ground level if overhead mounting is not feasible, so it works in both configurations without additional hardware changes.
• Plug-and-play operation requires no installation. The Dual 110 connects to a standard 110–120V outlet. There is no hardwiring, no electrician visit, and no waiting on installation. This makes it practical for operators who need to add dehumidification capacity quickly or reconfigure a room between cycles.
• Onboard dehumidistat for stand-alone control. An integrated dehumidistat lets the unit operate independently without an external humidity controller. Set your target relative humidity and the Dual 110 cycles on and off to maintain it. If you already run a lighting and environment controller in your room, the onboard stat provides a backup or secondary zone control option.
• Replaceable MERV-8 filter protects internal components. The included MERV-8 filter catches airborne particulates before they reach the refrigerant coils and internal fan, extending service life in grow environments where dust, pollen, and particulates are elevated.
• Made in the USA by a purpose-built horticultural HVAC manufacturer. Quest Climate designs and manufactures dehumidifiers specifically for the controlled environment agriculture market. The Dual 110 is built to handle the elevated moisture loads and operating schedules common in commercial grow rooms, not repurposed from residential or light commercial applications.
• Optional accessories extend placement flexibility. When a gravity drain or floor drain is not accessible, an optional condensate pump kit handles water removal automatically. Optional ducting kits allow the unit’s intake and discharge to be directed to suit unusual room layouts or ducted ceiling plenums.

Best Uses for the Quest Dual 110 Overhead Dehumidifier

The Dual 110 fits a specific category of grow operation: rooms where humidity control is critical, floor space is at a premium, and operators want a self-contained solution without a separate humidity controller.

• Indoor grow rooms with high plant density. Dense canopies transpire significant moisture, particularly during late vegetative and flowering stages. A 110-pint-per-day unit provides meaningful dehumidification capacity for mid-size commercial or serious hobby rooms where a small portable unit is insufficient.
• Rooms where floor space is fully committed. When every square foot of floor is occupied by containers, reservoirs, trays, or walkways, overhead mounting removes the dehumidifier from the footprint entirely. The Dual 110’s dimensions (26″ × 14.5″ × 19.4″) and 85-lb weight require proper overhead structural support, but the payoff is reclaimed floor area.
• Facilities without a central HVAC dehumidification system. Warehouses and retrofitted grow spaces often rely on split A/C units that provide cooling but limited latent capacity. The Dual 110 supplements existing HVAC by targeting humidity specifically, rather than overcooling the space to drive moisture out.
• Operators who want plug-and-play flexibility. Because the unit runs on a standard outlet and includes an onboard dehumidistat, it is a practical choice for operators who move equipment between rooms or facilities, or who need to add capacity to a room without infrastructure changes. Pairing it with a condensate pump extends placement options when a floor drain is not nearby.
• Environments prioritizing air quality alongside humidity control. The MERV-8 filter provides basic particulate filtration as a byproduct of the unit’s operation, which can be useful in grow rooms where airborne spores or dust are a concern. This does not replace a dedicated air filtration system, but it adds a layer of protection for the unit’s own internals and the surrounding air.

Quest Dual 110 vs Quest Dual 105

Quest’s own product documentation directly references the Dual 105 as a comparison point for the Dual 110. The key difference between the two models is energy efficiency, not raw removal capacity:

Spec	Quest Dual 110	Quest Dual 105
Water removal	110 pints/day	105 pints/day
Energy efficiency	Over 5.8 pints/kWh	8.8 pints/kWh
Overhead design	Yes	Check model specs

Based on the published efficiency ratings, the Dual 105 is more energy-efficient at 8.8 pints/kWh compared to the Dual 110’s 5.8 pints/kWh. If operating cost per pint removed is a primary consideration, review both models against your room’s target humidity load. If total removal capacity, overhead mounting, and plug-and-play convenience are the priority, the Dual 110 delivers those with minimal setup friction. Quest positions the Dual 110 as improved value relative to the Dual 105, which may reflect differences in purchase price, manufacturing cost, or other design trade-offs beyond what is published in the canonical product description.

Compatibility

The Quest Dual 110 is compatible with a standard 110–120V, single-phase electrical supply — the same outlet used by most residential and light commercial electrical circuits in North America. At 7.4 amps, it draws less than a standard 15-amp circuit’s continuous-use limit (12 amps), so it can typically share a circuit with light loads, though a dedicated circuit is recommended for any continuous-duty equipment in a grow environment.

The unit’s onboard dehumidistat allows it to operate as a stand-alone device without any external controller. If your facility runs centralized environment control, the Dual 110 can also be switched on and off by an external relay or environment controller — consult Quest’s documentation for wiring details specific to your control system.

Quest offers an optional condensate pump kit and optional ducting kits for the Dual 110. The condensate pump kit is the right accessory when there is no gravity drain within reach of the unit’s condensate line. Ducting kits allow you to direct airflow intake and discharge through walls or ceilings, which is useful in rooms with ducted HVAC plenums or where you need to separate the dehumidifier’s air handling zone from the main canopy area. If you already use an active air circulation fan for canopy airflow, adding the Dual 110 overhead addresses humidity independently without competing with your circulation strategy.

The replaceable MERV-8 filter uses a standard filter format. Replacement filters are available through Quest’s authorized distribution network. Filter change interval depends on particulate levels in your grow environment; Quest recommends checking and replacing the filter regularly to maintain airflow and unit efficiency.

Usage Guidelines

The Quest Dual 110 includes an onboard dehumidistat. Set the target relative humidity using the onboard control. The unit will run until the room reaches the set point, then cycle off until humidity rises again. Common target ranges in flowering grow rooms are 40–55% RH; vegetative rooms are often run higher, around 50–65% RH. Consult your strain’s specific requirements and your facility’s VPD targets.

Condensate drainage: The Dual 110 produces liquid condensate continuously during operation. Before running the unit, plan your drainage route. Options include:

• Gravity drain to a floor drain or external bucket via the condensate outlet.
• Optional condensate pump kit, which actively pumps water away from the unit to a drain or collection point at a higher elevation.

Filter maintenance: The MERV-8 filter should be inspected at least monthly in typical grow environments. Clogged filters reduce airflow and dehumidification efficiency. Replacement filters are a consumable item — budget for periodic replacement based on your room’s particulate levels.

Overhead placement considerations: When mounting overhead, verify that your mounting structure can support the unit’s 85-lb operating weight. The unit must be level for proper condensate drainage from the internal drain pan. Secure all mounting hardware before operating. Follow Quest’s mounting instructions included with the unit.

Ground-level placement: The Dual 110 can also be placed at floor level for immediate plug-and-play use without any mounting work. In this configuration, ensure adequate clearance around the intake and discharge vents for unobstructed airflow.

How to Set Up the Quest Dual 110

The Quest Dual 110 is a plug-and-play unit with no hardwiring or refrigerant work required. Setup follows these steps:

1. Choose your placement location. Decide between overhead mounting and ground-level placement. For overhead mounting, identify a structural support point (rafter, beam, or ceiling joist) capable of bearing at least 85 lbs continuously. For ground-level use, choose a location with clearance around all intake and discharge vents.
2. Mount or position the unit. For overhead installation, use appropriately rated mounting hardware. Ensure the unit is level so the internal condensate pan drains correctly. For ground-level placement, set the unit on a stable, flat surface.
3. Route the condensate line. Attach the condensate drain line to the unit’s outlet. Route to a floor drain via gravity, or connect the optional condensate pump kit if a gravity drain is not available. Verify the drain line has no kinks or uphill sections that would block flow.
4. Install or verify the MERV-8 filter. Confirm the filter is seated correctly in its housing before powering on. A missing or incorrectly seated filter will allow particulates to reach internal components.
5. Plug into a 110–120V outlet. Use a grounded outlet rated for continuous-duty loads. A dedicated 15-amp or 20-amp circuit is recommended. Avoid extension cords for permanent installations.
6. Set the onboard dehumidistat. Power on the unit and set your target relative humidity using the onboard control. The unit will begin operating immediately if ambient humidity is above the set point.
7. Verify operation. After 15–30 minutes, confirm the unit is producing airflow from the discharge vents, the condensate line is draining, and the room humidity is trending toward your set point.

Sources & Further Reading