Quest 155 High-Efficiency Dehumidifier QU6483

Quest 155 High-Efficiency Dehumidifier - 120V - R454B - QU6483

Quest

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Model

QU6483

199388

Was $3,667.00 Your Low Price Special Price $3,299.95

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Product Features

High-efficiency dehumidifier for commercial environments
120V operation for standard electrical compatibility
Uses R454B refrigerant for improved performance
Helps control humidity and prevent moisture damage

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Description

The Quest 155 High-Efficiency Dehumidifier (SKU: QU6483 / Model 4046120) is a commercial-grade moisture control system designed for residential, industrial, and controlled-environment applications. It delivers strong dehumidification performance while maintaining high energy efficiency and operating on standard 110–120V power.

With a capacity of up to 155 pints per day, this unit is engineered for medium to large spaces such as basements, warehouses, grow rooms, restoration sites, and other humidity-sensitive environments. It uses R454B refrigerant and Quest’s advanced M-CoRR multi-coil technology to maximize efficiency while reducing heat output and operating costs.

The Quest 155 is built for continuous-duty operation and supports flexible installation as either a standalone unit or ducted system component. Its integrated digital controls and high airflow design ensure consistent humidity management in demanding applications.

Product Features:

155 PPD Moisture Removal Capacity: High-output dehumidification for medium to large environments.
110–120V Operation: Standard voltage compatibility for simplified installation.
R454B Refrigerant System: Efficient refrigerant technology for improved environmental performance.
M-CoRR Multi-Coil Technology: Enhances efficiency and reduces heat output during operation.
High Airflow Design: Supports effective humidity control in larger spaces.
Continuous Duty Operation: Built for 24/7 performance in demanding environments.
Integrated Digital Controls: Allows precise humidity setpoint adjustment and monitoring.

Warranty

The Quest 155 typically includes a 5-year limited manufacturer warranty, depending on distributor and installation conditions. Refer to official Quest documentation or an authorized dealer for complete warranty details.

Product Specifications

More Information
Quest 155 High-Efficiency Dehumidifier QU6483
Feature	Spec
SKU	QU6483
Weight (in lbs)	130.000000
Brand/Manufacturer	Quest
Included Items	Dehumidifier (1), feet (4), drain hose (1), drain adapter (3/4” NPT PVC to 5/8” hose barb), rivnut plugs (4)
Additional Information	Auto-Restart
Additional Information	Number of Fan Speeds: 1
Additional Information	Energy Factor: 3.5 L/kWh
Additional Information	Safety Certified: UL rated, ETL listed
Heating BTU	7,100
Maximum CFM	500 CFM
Refrigerant	R454B
Capacity	155 pints
Wattage	920 W
Max Breaker Size	8 Amps
Height	21.75"
Width	20.25"
Depth	37.8"
Pint Capacity	151-199
Usage	Ducted, Indoor Growing/Greenhouses, Kennels/Stables, Repair Shops/Garages, Barn/Shed
Additional Info	Cabinet Width: 23.6"
Warranty	1-Year Parts and Labor \| 5-Year Sealed Refrigerant System
Resources	Catalog Specifications Sheet Owner's Manual You will need Adobe® Acrobat® Reader to view PDF documents.
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.

Reviews 1

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Using in unfinished basement on floor. The shipping pallet is useful as a stand and the screw in legs allow to slant the unit to aid drainage. It is quiet and its smaller size and weight are huge positives relative to alternatives. Quickly and efficiently reduced humidity to desired level. So far so good.
Review by jeremy
Posted on 10/23/25

Questions and Answers

Customer Questions

Who Makes Quest?

Quest dehumidifiers are proudly manufactured in the United States, specifically in Madison, Wisconsin. This is the home base of Therma-Stor LLC, the company behind the Quest brand. Therma-Stor has built a strong reputation in the HVAC and indoor air quality industries for producing high-performance, durable, and energy-efficient dehumidification systems.

Is installation difficult or do I need a professional?

While many Quest units are plug-and-play, larger models or those requiring overhead mounting may need a professional HVAC technician for safe and proper installation.

How do I know which Quest dehumidifier model is right for my space?

Start by measuring the square footage and ceiling height of your space. Then, consider moisture levels and how often the area is in use. Quest offers models with capacities ranging from around 70 to over 500 pints per day, so there’s an option for everything from small grow rooms to large industrial spaces.

What kind of maintenance is required?

Routine maintenance includes checking and replacing filters regularly, inspecting drainage lines, and cleaning the coils periodically. Most users find the upkeep simple and manageable.

How often do I need to clean or change the filter?

Most customers check the filter every 1–3 months. Depending on dust levels and usage, you may need to clean or replace it quarterly.

What is the warranty on Quest dehumidifiers?

Quest dehumidifiers come with a 5-year warranty on parts and refrigerant system components, offering long-term reliability and peace of mind.

How noisy are Quest dehumidifiers?

Noise levels vary by model, but most units are quiet enough for use in occupied commercial spaces. For grow rooms and workspaces, the sound is often comparable to a running HVAC system.

Can I run the dehumidifier continuously?

Yes, most Quest dehumidifiers are built for continuous operation. They include features like automatic defrost and humidity set points to maintain consistent performance without constant supervision.