Quest Dehumidifier 100 – 44 L/day at 26.7 °C/60% RH with M-CoRR compressor and MERV 13 filter

Quest 100 Dehumidifier

Professional dehumidifier from Therma-Stor (USA), with a multi-coil M-CoRR compressor that reuses energy from the circuit, R454B refrigerant, and a MERV 13 filter. It is a fixed-installation unit designed for grow rooms and, above all, drying rooms.

Capacity and measurement conditions

44 L/day at 26.7°C and 60% RH (American AHAM standard).
29.3 L/day at 23.9°C and 50% RH.

This is the most important information for comparing dehumidifiers, and almost no one publishes it: liters/day are not comparable between brands because they are not measured the same way. Quest publishes according to AHAM, at 26.7°C / 60% RH. Brands like VDL or Cyclone publish at 30°C / 80% RH, much more favorable conditions that give considerably higher figures for the same equipment. A "VDL 50 L/day" and a "Quest 44 L/day" are not on the same level: the Quest is measured under much lower conditions.

In addition, Quest is one of the few that publishes a second measurement point at 23.9°C / 50% RH, which is exactly the scenario of a drying room. There you know what you are buying.

Specifications

• Capacity: 44 L/day at 26.7°C / 60% RH · 29.3 L/day at 23.9°C / 50% RH
• Efficiency: 3.2 L/kWh
• Consumption: 540 W · 2.5 A · 230 V
• Airflow: 280 CFM (~476 m³/h)
• Refrigerant: R454B · Compressor: M-CoRR multi-coil
• Filtration: MERV 13
• Operating range: 13-35°C
• Dimensions: 61 × 40.6 × 36.8 cm · Cable: 3 m
• Warranty: 3 years

Transparency note: some distribution sheets give 733 W for this model. The manufacturer indicates 540 W, and it is the value consistent with the amperage (2.5 A at 230 V) and with the efficiency of 3.2 L/kWh published in those same sheets. We use 540 W.

Control and installation

Digital controls with humidity setpoint at 1%, dark mode so as not to let light into the room, auto-restart after power outage, self-diagnosis, and filter change alert. It has handles and hanging points: it can be installed on the floor or suspended.

It does not have a tank. The drainage is continuous, via NPT thread, and requires a trap. It is a unit to leave installed, not to keep emptying.

The best argument: drying

Drying is where a crop is most at stake and where control is most critical: you have to maintain a stable 55-62% RH for 10-15 days, with constant water load and at low temperature, 18-20°C. Household units lose performance right there. The Quest 100 works from 13°C and is one of the few with declared performance at 23.9°C / 50% RH, which is practically the drying scenario. Added to the 1% setpoint and the MERV 13 filter, it is the reference option for a serious drying room.

How to size it

Forget about square meters: an indoor grow evaporates almost all the water that is watered. Add up the liters of watering per day and size it that way. And always compare against the figure measured in the real conditions of your room, not against the highest figure in the catalog.

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1. Decide on the installation: on the floor or suspended from above using the handles and the equipment's hanging points.
2. Connect the continuous drain to the NPT thread. A trap must be installed: the equipment has no reservoir.
3. Supply power at 230 V using the 3 m cable and check that the circuit can handle the equipment's 2.5 A.
4. Set the humidity setpoint on the digital controls, with 1% accuracy; for drying, between 55 and 62% RH.
5. Activate dark mode if the equipment is inside the grow room, to prevent light from entering during the dark period.
6. Replace the MERV 13 filter when the equipment alerts you; the self-diagnosis will also indicate any other issues.