The right Anden dehumidifier comes down to room size and the voltage you can run. Tents and 4x4 hobby rooms land on the A70 or A100 (115V). Single-light sealed rooms step up to the A130 or A210. Flower rooms with multiple HID or high-PPFD LED fixtures want the A320, available on 115V or 240V V3 platforms. Multi-room facilities and dedicated dry rooms run the A710, the largest grow-optimized portable unit in the lineup.
Who Makes Anden Dehumidifiers?
Anden is the controlled-environment brand of Therma-Stor, a Madison, Wisconsin manufacturer that has built commercial dehumidification equipment since the 1970s. Therma-Stor is the same parent that owns Aprilaire (whole-home HVAC) and Quest, the industrial-dehumidifier line you see in nearly every large commercial cultivation facility.
The short version: Anden and Quest are siblings, not competitors. They share a Therma-Stor refrigeration platform but get positioned differently. Quest leans toward fixed industrial installs (high static pressure, ducted commercial rooms, the 506 and 876 sit on the floor and move serious air). Anden was built around grow tents and sealed-room cultivators who need a grow-optimized portable they can hang from the ceiling and run without ducting. The chassis, controls, and filter design all reflect that focus.
I've watched buyers default to Quest because the brand name carries weight in commercial circles, then realize Anden is the cleaner fit for their 6x6 or 8x8 sealed room. Same engineering DNA, packaging tuned to a different use case.
The Full Anden Lineup
Anden's portable grow-optimized range spans 70 PPD at the small end to 710 PPD at the top. The current catalog includes:
- Anden A70: 70 pints per day (AHAM), 115V, the entry into the grow-optimized line. Sized for closets, single-tent rooms, and small dry spaces.
- Anden A100: 100 PPD, 115V, the workhorse for 4x4 to 5x5 tents and small bedroom conversions.
- Anden A130: 130 PPD, 115V, a popular pick for one-light sealed rooms in the 80 to 130 sq ft range.
- Anden A210 V1: 210 PPD, 240V. The first Anden that requires a dedicated 240V circuit. Built for two-light flower rooms or larger veg spaces.
- Anden A320 V1: 320 PPD, 240V, the legacy platform. Still the most common Anden in mid-sized commercial-grade rooms.
- Anden A320 V3: 320 PPD on Anden's updated V3 platform, with a refreshed control board, improved condenser geometry, and refrigerant changes to meet current EPA rules.
- Anden A710 V1: 710 PPD, 240V. The largest portable Anden, suited to multi-light flower rooms and dedicated dry rooms.
- Anden A710 V3: 710 PPD on the V3 platform.
The V1 and V3 designations matter when you're sourcing parts and integrating with controllers. More on that below.
What Are the Grow-Optimized Features?
"Grow-optimized" is one of those marketing terms that can mean very little. With Anden it has a specific definition. Three things separate this line from the Aprilaire whole-home units that share the same factory floor:
MERV-11 filtration on every model. Cultivation rooms run dirty. Leaf debris, perlite dust, root-zone media, mineral residue from foliar applications: it all ends up airborne. The MERV-11 pleated filter on the front intake catches that material before it reaches the evaporator coil. A clean evaporator stays at its rated SHR and keeps pulling its rated PPD; a fouled coil drops capacity quickly. The filter is washable and stocked at retail, so the maintenance cost is essentially zero.
Mounting flexibility built into the chassis. Every Anden ships with brackets sized for overhead hanging from ceiling joists or a unistrut grid. That matters because floor space in a sealed room is at a premium, and hanging the unit puts the discharge above the canopy where mixing actually happens. The A70 and A100 can sit on the floor or hang; the A130 through A710 are designed to hang, period. I run my A210 hung over the canopy and the placement makes a measurable difference on coverage versus floor-corner mounting.
0-10V control inputs. Every current Anden accepts an analog 0-10V signal for modulated humidity control from a room controller. That lets you pair the dehumidifier with an environmental controller that ramps capacity proportionally instead of bang-bang cycling on a humidistat. The result is tighter RH bands (plus or minus 2% rather than plus or minus 5%) and longer compressor life. For VPD-managed flower, this is the difference between hitting your setpoint and chasing it.
V3 platform changes. The V3 models (currently the A320 and A710) updated three things: the refrigerant moved to the newer EPA-compliant blend, the control board got a redesigned interface with brighter status LEDs, and the condenser tube layout was retuned for slightly better efficiency at lower room temps. If you're buying new today, V3 is what you want. V1 stock still ships and works fine, but parts availability over a ten-year horizon will be better on V3.
What Size Anden Do I Need?
Sizing a dehumidifier comes down to one calculation: how many pints of water per day does your room produce, and what's the room size in square feet. The pillar formula is covered in detail in our humidity control guide for indoor grows, but the short version for cannabis flower at typical canopy density runs around 4 to 6 pints per square foot per day during peak transpiration. So an 8x8 (64 sq ft) room peaks at roughly 256 to 384 PPD, which lines up with an A320 plus margin. The table below maps Anden capacity to room size and use case:
Two practical notes that don't fit in a table. First, AHAM ratings are measured at 80F and 60% RH. Real flower rooms run cooler and drier than that (typically 75 to 78F at 55 to 60% RH late in flower), so plan on roughly 70 to 80% of rated capacity at your actual setpoint. Second, the 115V to 240V jump between the A130 and A210 is a real electrical decision. If your panel doesn't have a spare 240V circuit, the A130 with a sister unit is often the cheaper path than a new circuit plus the A210.
How Does Anden Compare to Quest?
Quest and Anden share refrigeration engineering and reliability, so the choice is rarely about "which one breaks less." It's about form factor and install style. Quest's Dual and 506 are floor-standing units engineered for ducted central return systems and commercial mechanical rooms. Anden hangs over the canopy, runs without ducting, and is sized in PPD steps that map cleanly to room counts (one light, two lights, four lights, eight lights). For a head-to-head with a recommendation by use case, see our complete Quest dehumidifier guide; the deeper Anden-versus-Quest comparison is coming in a dedicated article.
Outside the Therma-Stor family, Ideal-Air and Active Air offer cheaper portable units in the sub-100 PPD range. They work for hobby grows. For anything sealed or commercial, Anden's 0-10V control, MERV-11 filtration, and Therma-Stor parts support put it in a different reliability tier. If you need higher capacity than the A710 in a single unit, you're looking at fixed industrial systems in the commercial dehumidifiers tier rather than another Anden.
