The Spider Farmer grow tent dehumidifier removes up to 32 pints of moisture per day at 95°F and 90% humidity and can sit outside your tent with its air duct feeding dry air in, so the unit's heat stays out of your growing space.
It is designed for 3 x 3, 2 x 4, and 4 x 4 ft tents, with an adjustable 30% to 80% humidity range, a remote sensor probe, a 24 hour timer, and auto defrost. Indoor growers who want measured control over tent humidity will get the most from it. Before first use, let the unit sit upright for 24 hours. You can browse compatible grow tent setups as well.
Specifications
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Moisture Removal: Up to 32 pints per day at 95°F and 90% RH
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Rated Coverage: Up to 2,000 square feet
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Tent Compatibility: 3 x 3, 2 x 4, and 4 x 4 ft tents
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Humidity Range: Adjustable from 30% to 80%, shuts off at target
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Sensor: Included probe measures humidity at the source with real time display
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Modes and Timer: Three selectable modes and a 24 hour timer
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Defrost: Automatic defrost
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Drainage: Water tank with full indicator light and audible alert, or continuous drain hose
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Grow Tent Design: Air duct output for placing the unit outside the tent
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Mobility and Maintenance: 360° wheels, carry handle, digital display, reusable filter screen
Humidity Control for 3 x 3 to 4 x 4 Grow Tents Without Adding Heat Inside
If your tent humidity climbs during late veg, flower, or drying, this unit lets you pull it down while keeping the dehumidifier itself outside the tent. You run the output duct through a tent port, so dry air goes in while the unit's warmth stays in the room, which matters when your grow lights are already pushing temperatures up.
The remote sensor probe reads humidity at canopy level instead of at the machine, giving you a more accurate picture of what your plants are experiencing. Plan your layout around the rear air intake and rear drain port, and keep space behind the unit for airflow. Balance it with your inline fan and ducting so the tent exhaust is not pulling dry air straight back out. For a full room larger than a single tent, you may need a higher capacity unit.
What to Expect from the Spider Farmer Grow Tent Dehumidifier in Real Use
Verified purchasers running it with 4 x 4 and 4 x 8 tents report it holding their target humidity, with an 8 x 4 tent of six plants kept near 50% while the surrounding room sat around 70%. Owners describe it as quiet, easy to roll around, and compatible with smart controller plugs. During drying on continuous mode, a grower emptied the tank once per day, and several route the drain hose to a bucket or sink.
A few issues come up. In auto mode, a reviewer found it pulled humidity down to the 50% setting but did not restart until humidity hit 65%. Another said the rear air intake and short corrugated drain hose force it near a wall, and it only reached 70% in an 8 x 8 room. The plastic tabs on the vent adapter broke for a grower running it outside the tent. One unit stopped working after two months and was replaced. Several wished the internal tank were larger.
Real-world performance notes sourced in part from verified Amazon customer purchases.
Frequently Asked Questions
Should a dehumidifier go inside or outside a grow tent?
Placing a dehumidifier outside the tent and ducting dry air in keeps the heat it produces out of your growing space and frees up floor room for plants. This unit is designed for that setup with its air duct output. Running it inside the tent works too, but you will add heat to the tent, which your ventilation then has to remove.
Why does a dehumidifier need to sit before you turn it on?
Dehumidifiers with refrigerant systems can have their internal oil and refrigerant shift when the unit is tipped or moved. Letting it sit upright gives everything time to settle back into place before the system runs. This unit should sit upright for 24 hours before first use.
Why does my dehumidifier wait until humidity rises before turning back on?
Many dehumidifiers use a buffer range so they do not switch on and off every few minutes, which reduces wear on the system. The unit shuts off when it reaches your target and restarts only once humidity climbs a set amount above it. If the swing is too wide for your plants, set the target a little lower or use an external humidity controller to switch the unit on and off at the exact levels you want.
