Humidity control

Hold the moisture steady.

Dehumidifiers take water out of the air, humidifiers put it back, and a controller switches either at a set point. Rate them in litres a day against the room volume and the water going in.

Nothing matches all of those filters.

Dehumidifiers and climate units

Rated in litres a day

AC Infinity Hydrone Desiccant Dehumidifier – For Grow Tents

  • Real draw rate up to approx. 4L per day
  • Minimum humidity 25% RH
  • Drying levels 10, PWM controlled
  • Reservoir 2L (0.5 gal)
£146.99

Out of stock

RAM 12L Dehumidifier – Grow Room Humidity Control

  • Extraction Rate Up to 12 litres per day
  • Target Humidity Range 30% to 80% RH
  • Tank Capacity 2 litres
  • Drainage Internal tank or optional continuous hose drainage
£128.49

AlorAir Sentinel HD55 HDi90 HDi120 – Grow Room Dehumidifier

  • HD55 extraction 60L/day at 30°C, 80% RH
  • HD55 AHAM 30L/day at 26°C, 60% RH
  • HD55 coverage up to 1,300 sq ft
  • HD55 sound / drain under 52 dBA, gravity drain
£1,233.95

Dry Bag Disposable Hanging Dehumidifier – Moisture Absorber

  • Type disposable hanging (passive) dehumidifier
  • Moisture absorption capacity up to 500ml
  • Recommended coverage up to 1m2 per bag
  • Power none required (passive absorbing compound)
£6.50

RAM 20L Dehumidifier – For Grow Rooms & Grow Tents

  • Extraction 20L/day (30°C, 80% RH); 10L/day (27°C, 60% RH)
  • Power 220-240V AC, 50Hz
  • Power consumption 280W / 1.7A (27°C, 60% RH); 330W / 2.3A (30°C, 80...
  • Noise 41dB(A) or less
£171.99

AirLab HEPA Filter for 25L Dehumidifier – Replacement Filter

  • Brand AirLab
  • Fits AirLab 25L Dehumidifier
  • Filter type HEPA
  • Efficiency 99.97% of particles at 0.3 microns
£18.90

Gorilla Electric Dehumidifier 26L/Day – for Grow Tents

  • Extraction rate up to 26 litres/day
  • Modes Continuous, Auto, Silence, Defrost
  • Features oscillating airflow, tank-full indicator, timer
  • Fitting UK mains plug, portable, castors
£219.95

AlorAir Storm SLGR 1600X – 130L/Day Commercial Dehumidifier

  • Extraction 130L/day at 30°C, 80% RH
  • AHAM rating 71L/day at 26°C, 60% RH
  • Coverage up to 7,000 sq ft
  • Sound level under 55 dBA
£2,366.00

AlorAir Storm SLGR 1250X – 105L/Day Commercial Dehumidifier

  • Extraction 105L/day at 30°C, 80% RH
  • AHAM rating 50L/day at 26°C, 60% RH
  • Coverage up to 3,000 sq ft
  • Sound level 60 dBA
£1,858.00

AlorAir Guardian 72L & 90L – Grow Room Dehumidifier

  • Range AlorAir Guardian
  • 72L extraction 65L/day at 30°C, 80% RH
  • 72L AHAM 32L/day at 26°C, 60% RH
  • 72L coverage up to 2,368 sq ft (220 m2)
£1,010.00

AlorAir Storm LGR Extreme – 85L/Day Grow Room Dehumidifier

  • Extraction 85L/day at 30°C, 80% RH
  • AHAM rating 46L/day at 26°C, 60% RH
  • Coverage up to 3,600 sq ft
  • Sound level under 55 dBA
£1,424.00

Aqualine Dehumidifier – Grow Room Humidity Control

  • Brand Aqualine
  • Type Refrigerant dehumidifier
  • Power supply 220-240V / 50Hz
  • 12L model 210W, 12L per day, 2L tank, under 46dB, 105 m³/h ...
£159.95

Ora 60L Grow Room Dehumidifier – Digital RH Control

  • Extraction Rate 60L / 127 US pints per 24 hours
  • Power 650W
  • Power Supply AC 230V ±10% / 50Hz / 1P
  • Refrigerant R410A
£507.95

OptiClimate Pro 3 Grow Room Air Conditioner – Water-Cooled

  • Models Pro 3500, Pro 6000, Pro 10000
  • Functions Cooling, heating, dehumidification, filtration, a...
  • Cooling method Water-cooled, no coolant gases
  • Heating Ceramic heaters
£2,984.95

OptiClimate Revomax II Grow Room Air Conditioner

  • Modes Heating, cooling, dehumidifying, circulating, fil...
  • Inverter Infinity DC inverter, 30-100% cooling capacity
  • Minimum turndown 20-30% cooling capacity
  • Filtration Built-in carbon and dust filters
£4,373.95

Climate Master CM-145 Dehumidifier – 145L/Day for Grow Rooms

  • Extraction capacity up to 145 litres/day at 30°C, 80% RH (88 litres/d...
  • Power consumption 1200W
  • Airflow 650 m3/h
  • Dimensions 88 x 60 x 44 cm
£1,695.00

VIVOSUN AeroDrain D12 Dehumidifier – 12L/Day VPD Control

  • Moisture removal Up to 12 litres per day
  • Water tank capacity 2.1 litres, with auto shut-off when full
  • Drainage Tank collection or continuous gravity drain
  • Power 185W
£318.49

Quest 100 Dehumidifier – 44L/Day Compact Commercial, 230V

  • Model 4046590-XX (Quest 100, 50 Hz international)
  • Water removal 44 litres/day at 26.7°C / 60% RH; 29.3 litres/day...
  • Efficiency 3.2 litres/kWh (6.7 pints/kWh)
  • Power 540 W
£2,837.95

Dry Pot Disposable Room Dehumidifier – Moisture Absorber

  • Type disposable passive dehumidifier
  • Moisture removal up to 800ml per pot
  • Coverage recommended up to 1.2m2
  • Active ingredient moisture-absorbing compound
£7.50

Humidifiers

Ultrasonic and sonic, 2L up to 23L

G.A.S SonicAir Humidifier Pro – 6.5L/hr Ultrasonic Output

  • Maximum output 6.5 litres per hour
  • Spout 150mm directional
  • Water supply mains intake (no tank)
  • Power 300 watts
£297.95

AC Infinity CloudForge Smart Humidifier – VPD Control

  • Type ultrasonic evaporative plant humidifier
  • Tank capacity 4.5L (T3) / 9L (T5) / 15L (T7)
  • Mist output 240 to 1,300 ml/h depending on size (below)
  • Output levels 10 humidity levels
£72.49

Sonic Air Humidifier 23L – Grow Room Humidity Control

  • Reservoir capacity 23 litres
  • Maximum mist output 1.44 litres per hour
  • Power consumption 110W
  • Fill type Top-fill lid
£157.99

RAM 13L Ultrasonic Humidifier – 1100ml Per Hour Mist

  • Brand RAM
  • Product type Ultrasonic humidifier
  • Tank capacity 13L
  • Humidification rate 1100ml per hour
£94.49

G.A.S SonicAir Humidifier 10L – Ultrasonic Ceramic Mist

  • Reservoir capacity 10 litres
  • Vapour output up to 800ml per hour
  • Power draw 80 W
  • Outlets 4 rotatable
£74.90

Aqualine Humidifiers – Ultrasonic Grow Room Humidity

  • Type ultrasonic cool mist humidifiers
  • Range tank capacities from 2.3 L to 23 L
  • Mini One (2.3L) 2.3 L tank, covers up to 1m x 1m x 2m, up to 10 h...
  • Midi Mist (4.5L) 4.5 L tank, covers up to 1.2m x 1.2m x 2m, max 28...
£32.49

Sonic Air PRO Humidifier Bundle – IHC Dual VPD Controller

  • Humidifier G.A.S SonicAir Pro, ultrasonic
  • Maximum mist output 6.5 litres per hour
  • Power 300W
  • Noise level under 35 dB
£539.99

Pure Factory Humidifier 8L – Ultrasonic, 350ml/hr

  • Reservoir capacity 8 litres
  • Mist output adjustable up to 350ml/hr
  • Run time up to 32 hours per fill
  • Technology ultrasonic cool mist
£44.95

Grow Bitz Humidifier – Ultrasonic Humidifier for Grow Room

  • Brand Grow Bitz
  • Type ultrasonic cool-mist humidifier
  • Tank capacity 16L or 23L
  • 23L model 110W, 220-240V 50Hz, castor wheels, single direct...
£114.95

Gorilla Humidifier 50L – for Grow Rooms, Auto Refill

  • Reservoir capacity 50 litres
  • Power 106W
  • Features adjustable nozzle, float valve ready for auto-refill
  • Fitting UK mains plug
£149.95

Garden HighPro HumiPro Humidifier – 4L Mist for Grow Tents

  • Reservoir capacity 4 litres
  • Power consumption 32W
  • Control built-in humidistat with 24hr timer function
  • Output twin nozzle, 360-degree rotation, ultrasonic mist
£44.90

RAM 5L Ultrasonic Humidifier – 400ml Per Hour Mist

  • Type Ultrasonic cool mist humidifier
  • Tank Capacity 5 litres
  • Maximum Output Up to 400ml per hour
  • Power 30W
£39.49

Mist Maker Ultrasonic Humidifier – 3 Disc, 1200ml/h

  • Type ultrasonic disc mist maker
  • 3 disc 1200 ml/h output
  • 5 disc 1600 ml/h output
  • 12 disc 5300 ml/h output
£59.49

VIVOSUN AeroStream Ultrasonic Grow Tent Humidifier

  • Models AeroStream H05, H09 and H19
  • Tank capacities 5 litre (H05), 9 litre (H09), 19 litre (H19)
  • Mist type fine ultrasonic mist
  • Output control adjustable
£68.49

Controllers and sensors

Switch at a set point

Gorilla GHC-01 Dual VPD Controller – for Grow Tent Climate

  • Model GHC-01
  • Outputs 2 switched mains outlets (humidifier + dehumidifier)
  • Control day/night humidity set points, temperature check
  • Display backlit LCD with max/min logging
£94.95

Faran HR-EHSA Analogue Humidistat – Humidity Controller

  • Measurement range 10% - 80% RH
  • Accuracy ±5%
  • Operation span 3%
  • Switch capacity 2.2A
£89.90

Faran HR-DHTC Digital Humidistat – Dual Output Controller

  • Power supply AC220V, 50/60Hz
  • Temperature measurement -50°C to 99.9°C
  • Humidity measurement 0-100%
  • Output control relay, 220VAC
£149.50

Dimlux Humidity Sensor – For Dimlux Maxi Controller

  • Type Relative humidity sensor
  • Compatible With Dimlux Maxi Controller
  • Cable Lengths 5 metres, 10 metres
  • Function Reports grow room humidity to the controller'...
£32.49

G.A.S Day & Night Dehumidifier Controller – For Grow Tents

  • Brand G.A.S.
  • Product type Day and night dehumidifier controller
  • Control Two dials, daytime (left) and night time (right)
  • Function Switches a connected dehumidifier on and off to h...
£99.45

Dimlux Maxi Controller v1.2 – Climate & Light Control

  • Version v1.2
  • Fixture capacity Up to 160 Dimlux Expert fixtures or Xtreme ballasts
  • Controls Lighting, CO2, heating, humidity, fans
  • Monitors CO2, vapour pressure deficit (VPD), plant tempera...
£356.95

Growlink ClimaLINK Climate Sensor – Humidity, Light and VPD

  • Measures Temperature, humidity, light, optional CO₂
  • Temperature Range -40 to 125°C, accuracy ±0.1°C
  • Humidity Range 0 to 100% RH, accuracy ±1.0%
  • CO₂ Range (optional) 0 to 5,000 ppm, accuracy ±3%
£395.95

Quest DEH 3000R Humidity Controller – For Dehumidifiers

  • Type digital humidity and ventilation controller
  • Display backlit LCD (humidity, temperature, date, time)
  • Control adjustable humidity set point (single target, no ...
  • Fan modes continuous or automatic
£344.49

Drying and curing

Hold humidity steady while produce dries

Integra Boost Humidity Regulator Packs – 55% and 62% RH

£1.60

Cannatrol Cool Cure C2 WiFi Drying and Curing System

£2,384.95

Filters, duct kits and spares

Mist Maker Humidifier Float – For 3, 5 and 12 Disc Units

£14.49

Quest 100 Dehumidifier Accessories – Filter, Duct, Hang Kit

£44.95

Quest 70 Overhead Dehumidifier – 26L/Day, 480W, MERV 13

£1,289.45 £1,289.95

Quest 155 Dehumidifier Return Duct Kit (4028610)

£79.49

The full range

Humidifiers, dehumidifiers and humidity controllers

Plants want different humidity at different stages. Our grow tent humidity guide works to roughly 70% RH for cuttings and seedlings, 60% in veg, 50% in early flower and 40% towards the end. Too dry and cuttings wilt; too damp in flower and mould takes hold. Extraction alone rarely holds those numbers through a UK winter and summer, which is where this kit comes in.

Humidifiers: the RAM 5L, Pure Factory 8L and Garden HighPro HumiPro suit a single tent; the VIVOSUN AeroStream, AC Infinity CLOUDFORGE, Aqualine and G.A.S SonicAir ranges step up to larger tanks and stronger output, and the Gorilla 50L and SonicAir Pro are built for rooms. Dehumidifiers: Dry Bag and Dry Pot for small spaces with no power; the RAM 20L, Aqualine, Gorilla 26L, VIVOSUN AeroDrain D12 and AC Infinity Hydrone for tents; the Ora 60L, AlorAir, Quest and Climate Master units for rooms. Control: humidistats from Faran and Cli-Mate, and the G.A.S, Gorilla GHC-01 and Quest DEH 3000R controllers switch the unit on and off for you.

Choosing the right unit

Dehumidifiers are rated in litres pulled out per day, so size to the room and how many plants are in it, not just the tent. Humidifiers are rated by tank size and mist output; a bigger tank means fewer refills. Whichever you run, put it on a humidistat or VPD controller so it works to a target instead of flat out.

Pair either with circulation fans so damp air does not settle under the canopy. Free Express Delivery over £60, or collect from our Wembley shop.