Quest 746 High Capacity Dehumidifier, 480V

The Quest 746 480V High-Efficiency Dehumidifier is the next generation of commercial and industrial dehumidification featuring Quest’s patented M-CoRR®^TM Technology. This multi-coil design reuses energy during dehumidification allowing it to be the most energy-efficient 480-volt dehumidifier on the market. Engineered for large-scale environments, this high-capacity unit combines superior moisture removal, energy efficiency, and smart digital controls—all in a more compact design.

Working alongside M-CoRR® is patented DART (Dynamic Airflow Response Tuning), intelligent control logic that adjusts fan speed as defrost conditions approach. DART helps slow or prevent ice buildup, keeping the compressor running longer for more consistent water removal and environmental control.

The Quest 746 480V uses less amperage at a higher voltage, freeing up space on your electrical panel for other equipment, a game-changer in controlled environments. With its reduced height, it fits where other industrial dehumidifiers can’t, making it ideal for mechanical rooms, overhead installations, and space-limited facilities. Built for performance, it removes approximately 730 pints of moisture per day (80°F, 60% RH) with an industry-leading efficiency of 8.3 pints per kWh, helping facility managers lower operating costs without compromising climate control.

now with Digital Controls

The Quest 746 now features an integrated onboard digital control panel, allowing precise humidity management with:

• Adjustable RH setpoints in 1% increments
• Filter change and defrost notifications for easier maintenance
• Self-diagnostics to speed up service and reduce downtime
• Dark Mode for reducing light in sensitive environments
• Low voltage terminal block for optional external control connection

Environmentally Responsible Refrigerant

Sustainability comes built-in. The second-generation Quest 746 utilizes R454B refrigerant, a more environmentally responsible choice than R410A and R32, with a significantly lower global warming potential—delivering powerful dehumidification with a smaller environmental footprint.

Straight from madison, WI

The Quest 746 480V dehumidifier is engineered and assembled in Madison, Wisconsin. It’s backed by a 5-year warranty for peace of mind. Additionally, this unit meets California Title 24 requirements for ducted (whole-home) installations.

Freight Shipping Notice:

This item ships via freight due to size and weight. Additional shipping charges will apply. We will contact you after checkout with a freight quote or reach out for a custom shipping estimate before ordering.