Quest Dual 155 Overhead Dehumidifier · 73L/Day Professional Climate Control

The Quest Dual 155 Overhead Dehumidifier is the heavy artillery you need to declare war on excess humidity, designed specifically to be suspended from the ceiling and free up your grow room floor while removing 73 liters of water per day with surgical precision. If you are tired of playing with amateur toys and want to professionalize your indoor garden, this machine is the definitive step towards a stable, healthy, and productive environment.

Is humidity controlling you, or are you controlling it?

We know the feeling: you go to bed worried, wondering if the relative humidity will spike while the lights are off. That fear of opening the tent and finding the dreaded powdery mildew or botrytis on your densest buds is a nightmare that keeps many growers awake. Relying on small, inefficient dehumidifiers that fill up quickly or generate too much heat makes you feel like you're constantly "winging it," leaving the fate of your harvest to chance.

This lack of control translates into constant stress. You can't enjoy the process if you're obsessively checking the hygrometer every hour. Plus, a fluctuating environment stresses your plants, stunts their growth, and in the worst-case scenario, forces you to throw months of work and money into the trash because of a fungal infection. It's not just about comfort; it's about the survival of your crop.

The Quest Dual 155 is the solution to regain command. By installing this beast, you are integrating a professional tool that stabilizes the environment automatically and efficiently. It allows you to dial in the perfect VPD (Vapor Pressure Deficit), ensuring that your plants transpire and feed exactly as they should, without the risk of mold ruining the party.

More space, fewer worries

One of the biggest headaches in an indoor setup is the lack of space. Traditional dehumidifiers are bulky, get in the way, and take up footprint that could be used for more plants. The Quest Dual 155 is designed with overhead installation in mind. By hanging it from the ceiling or roof structure, you make it virtually "invisible" to your workflow.

This "discretion" in placement means you can move freely around your room without tripping over cables or tanks. It is ideal for Large grow tents or dedicated rooms where every square centimeter counts. By keeping the equipment up high, you also improve air circulation, treating the air where heat and humidity naturally rise, creating a much more uniform loop.

Control over the experience

• Beast-mode Capacity: Removes up to 73 liters per day, keeping humidity stable even during the heavy transpiration phase of late flowering.
• Energy Efficiency: With an efficiency of 7.33 L/kWh, it consumes less electricity than standard units, saving you money on the monthly bill.
• Superior Filtration: Includes a MERV-13 filter that traps mold spores, dust, and pollen, actively purifying the air while drying it.
• Onboard Dehumidistat: Allows for low-voltage terminal control, giving you precise management over the activation points.
• Wide Operating Range: Works effectively from 13°C to 43°C, adapting to both cool nights and hot days.

How to use it responsibly and comfortably

Installing a unit like this might seem intimidating, but it's designed to be set up once and forgotten. Here is how to integrate it into your routine:

1. Secure Suspension: Use heavy-duty chains or ratchets to hang the unit from the ceiling bars or structure. Ensure it is level for proper drainage.
2. Drainage Setup: Connect a hose to the drain port (3/4” NPT) and route it to a sink, a large tank, or a floor drain. You will never have to empty a bucket again.
3. Airflow Management: Position the unit so the exhaust air doesn't blow directly onto the plants to avoid wind burn. It works great alongside your Climate Control system.
4. Dial it In: Set your desired humidity level (e.g., 50-55% for flowering).
5. Maintenance: Check the MERV-13 filter every cycle. If you use an Odor eliminator for weed, make sure it doesn't clog the intake.

Benefits of having everything under control

• Total Peace of Mind: Sleep soundly knowing the humidity won't spike unexpectedly.
• Heavier Yields: A stable environment allows plants to maximize photosynthesis and nutrient uptake.
• Fungal Protection: Drastically reduces the risk of powdery mildew and bud rot.
• Professional Routine: Moves you from "hobbyist" to "pro" status, automating one of the most critical aspects of growing.
• Space Optimization: Zero floor footprint means more room for roots and fruits.

Frequently Asked Questions

Does the Quest Dual 155 generate a lot of heat?

Like all dehumidifiers, it generates some heat as a byproduct of operation. However, due to its high efficiency, it generates significantly less heat per liter of water removed compared to cheaper, residential units.

Is it loud?

It is surprisingly quiet for its industrial capacity. While not silent, the noise level is comparable to a standard fan, and since it is usually installed in a grow room, it won't disturb your daily life.

Can I use it with a controller?

Yes, the Quest Dual 155 is compatible with most external environmental controllers (24V), allowing you to fully automate your climate system.

What voltage does it need?

This unit operates on 220-240V, which is standard for most European household and commercial outlets, but always check your circuit capacity (Amperage: 4.18A).

Personal Experience of Pevgrow’s CEO (Alan)

"I remember when I made the jump from standard dehumidifiers to a Quest unit. The difference was night and day. Before, I was constantly battling humidity spikes when the lights went off, running to empty tanks twice a day. It felt like a part-time job just managing the air."

"With the Quest Dual 155, the stability is incredible. I hung it up, piped the drain to the outside, and basically forgot about it. The plants responded immediately—greener leaves, faster growth, and rock-hard buds because the VPD was finally perfect. If you are serious about quality, this is one of the best investments you can make."