Quest Dehumidifier 375 – 170 L/day at 26.7 °C/60% RH for professional grow and drying rooms

Quest 375 Dehumidifier

The top model in Therma-Stor's (USA) professional range: energy-reclaiming multi-coil M-CoRR compressor, R454B refrigerant, MERV 13 filter, and an efficiency of 3.6 L/kWh, the highest in the family. For large grow rooms and multi-batch drying rooms.

Capacity and testing conditions

170 L/day at 26.7°C and 60% RH (American AHAM standard).

It is worth repeating because this is what causes the most purchasing mistakes: liters/day are not comparable between brands. Quest measures according to AHAM at 26.7°C / 60% RH. VDL and Cyclone measure at 30°C / 80% RH, much more favorable conditions that inflate the same equipment's figure. At Quest's conditions, any equipment performs considerably less on paper. If you compare 170 L/day AHAM with 138 L/day measured at 30/80, you are not comparing similar equipment.

Specifications

• Capacity: 170 L/day at 26.7°C / 60% RH
• Efficiency: 3.6 L/kWh
• Consumption: 2,550 W · 9.3 A · 230 V
• Airflow: 950 CFM (~1,615 m³/h)
• Refrigerant: R454B · Compressor: multi-coil M-CoRR
• Filtration: MERV 13
• Operating range: 13-35°C
• Dimensions: 83.6 × 60.2 × 62.5 cm · Cable: 6 m
• Warranty: 3 years

Control and installation

Digital controls with 1% humidity setpoint, dark mode, auto-restart after power outage, self-diagnosis, and filter change alert. Handles and hanging points for floor or aerial installation.

It does not have a tank. Only continuous drainage via NPT thread, which requires a trap. It is a fixed-installation unit.

The scenario where it is most noticeable: drying

Maintaining 55-62% RH for 10-15 days at 18-20°C with a constant water load is the hardest thing you can ask of a dehumidifier. The 375 works from 13°C, has a 1% setpoint, and moves 1,615 m³/h, which homogenizes the room's air instead of drying only its corner. It is the equipment that maintains a large drying without hiccups.

How to size it

Do not size it by square meters: an indoor grow evaporates almost all the water that is watered. Add up the liters of watering per day in the room and compare with the capacity under the conditions of your room, not with the highest catalog figure you find.

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1. Choose the setup: on the floor or suspended using the handles and the chassis hanging points.
2. Connect the continuous drain to the NPT thread and install a trap. The unit does not have a reservoir.
3. Supply power at 230 V using the 6 m cable; check that the line can handle the unit's 9.3 A.
4. Set the humidity setpoint to 1% on the digital controls; for drying, between 55 and 62% RH.
5. Position the airflow so that the 1,615 m³/h circulate throughout the entire room and not just its immediate surroundings.
6. Replace the MERV 13 filter when the unit indicates it and check the self-diagnosis periodically.