Condensing Dehumidifier FAQ

Direct answer Size a floor standing dehumidifier on real removal capacity, not the nameplate figure. Work out the moisture load from room volume, the humidity change you need and the infiltration from doors and people, then divide by 0.6–0.7 to convert that real requirement into the nameplate capacity you should buy. 0.6–0.7Real / nameplate conversion factor 1.1–1.2Safety factor on calculated load +30–50%Uplift for frequent door openings ±5% RHNormal control band to design to Capacity bands by floor area Band selection gets you to a shortlist in minutes; a load calculation confirms it. Floor area (4–6 m ceiling)Real capacity neededNameplate to buyTypical configuration Up to 200 m²70–100 L/day120–150 L/day1 unit 200–400 m²100–200 L/day150–300 L/day1–2 units 400–800 m²200–350 L/day300–500 L/day2–3 units 800–1,500 m²350–600 L/day500–900 L/day3–4 units Over 1,500 m²Project-specificProject-specificDucted or zoned system Ceiling height correction: capacity tables assume a 2.6–3 m ceiling. For every metre above that, add roughly 25–35% to the volume-based figure. A 500 m² hall with a 6 m ceiling should be sized closer to 900 m² of nominal area. Three adjustments people forget 1Low target humidityThe lower the setpoint, the harder the machine works. Below 45% RH, check the performance curve — capacity can fall well below the rating. 2Door traffic and infiltrationMore than 20 door openings a day means adding 30–50%. Airlocks, strip curtains or air curtains reduce this load at source. 3Wet processes and occupancyOpen water, wet floors, plant transpiration and people all add load. Each occupant contributes roughly 50–80 g/h of moisture. Why oversizing is also a mistake A unit that is far too large hits its setpoint quickly and short-cycles. That raises peak electrical demand, wears the compressor faster, and leaves humidity unevenly distributed because the fan never runs long enough to mix the room air. The practical target is a machine that runs long, steady cycles at the design condition, with enough reserve to recover after door openings. Where the load varies a lot through the day, two smaller units on independent humidistats will track the load far better than one large one. Right-sized units run longer cycles, which improves both air mixing and equipment life. In wide halls, several mid-size units placed diagonally outperform one large machine. Representative project configuration Cold-store antechamber400 m² · 7 m ceilingHeavy traffic The space between a frozen store and the loading dock suffered constant floor icing. Nominal area was 400 m², but the 7 m ceiling and continuous dock traffic pushed the real requirement far higher. Volume correction400 m² → sized as ~850 m² Infiltration uplift+40% (over 20 door cycles/day) Installed3 × 480 L/day An air curtain was added at the dock door at the same time, which cut the infiltration load and let all three units hold the target without running continuously. Related questions What size condensing dehumidifier do I need for a 500 m² warehouse? What is a floor stand dehumidifier best used for? When should I choose a ceiling mounted dehumidifier over a floor unit? How portable are industrial hand push dehumidifiers? Want your capacity confirmed?Send area, ceiling height, current and target RH, door traffic and any wet processes. East Dehumidifier returns a sized configuration. Request sizing

Direct answer A floor stand dehumidifier is a self-contained, ground-mounted unit that you position wherever the moisture problem is. It is best used in warehouses, basements, logistics halls, food and textile stores, indoor pools and production areas — anywhere the space runs at normal ambient temperature, the target is 45–60% RH, and you want capacity you can move or add without building work. 20–1000 L/dayTypical capacity range 45–60% RHWhere it performs best No ductingInstalled in minutes 8–12 mEffective coverage radius per unit Where a floor standing unit is the right answer A floor standing unit needs no ductwork, no ceiling void and no structural work to start drying a space. Warehouses and logisticsProtects cartons, pallets, textiles and metal goods from mould, rust and moisture regain. Multiple units give flexible coverage across racked aisles. Basements and underground storesSolves persistent damp where ventilation alone cannot, and where no ceiling void exists for a ducted unit. Food and beverage areasControls condensation on cold surfaces, keeps packaging dry and reduces slip hazards on floors. Production hallsSteadies humidity around hygroscopic processes such as paper, wood, adhesives and coatings. Indoor pools and leisureHandles continuous evaporation while limiting structural condensation and corrosion. Construction dry-outSpeeds screed, plaster and paint drying before handover, then moves to the next site. Floor stand versus the other mounting options FactorFloor standCeiling mountedHand push Floor space usedYes, about 0.5–1 m²NoneYes, but movable InstallationPlace and connect powerStructural fixing, drainageWheel in and plug in Air distributionLocal, needs spacingWhole-room, more uniformTargeted, temporary Best forLarge open areas, phased budgetsTight floor space, cleanroomsMulti-site, temporary work Capacity ceilingUp to 1000+ L/dayMedium rangeLow to medium range Floor space is the trade-off. If every square metre of floor is revenue-producing — a clean production line, a packed cold store — a ceiling mounted dehumidifier is usually worth the extra installation cost. If the floor is racking and aisles, floor standing units in unused corners cost less and are easier to service. Practical installation notes Leave 50 cm of clearance on the intake side and at least 30 cm behind the unit. Do not place a unit directly against a wall or inside a tight rack pocket — restricted airflow is the most common cause of disappointing performance. Drainage comes first in the planning. A gravity hose needs a continuous fall to a floor drain; where that is impossible, choose a pump-equipped model and check the lift height. Filter cleaning every two to four weeks keeps capacity stable in dusty environments. Floor standing units are typically placed along walls or in unused corners, spaced to cover the full floor plate. East Dehumidifier floor standing units are tested for electrical safety, control logic and capacity before dispatch. Representative project configuration Textile raw-material store800 m²Target 55% RH A yarn store was seeing fibre regain variation between seasons, which showed up as inconsistent fabric weight downstream. The building had no ceiling void and no spare floor drainage on one side. Installed3 × 240 L/day, two gravity drained, one pumped Result68% → 55% RH, held ±5% Floor costLess than 3 m² total Mixing gravity-drained and pump-equipped models on the same site let the operator use existing drainage where available and avoid new floor work on the far side of the building. Related questions How do I choose the right floor standing dehumidifier capacity? Floor stand vs ceiling mounted dehumidifier: which saves more space? Hand push dehumidifier vs fixed installation: which is more cost-effective? What maintenance does a floor stand dehumidifier need and how often? Choosing between mounting types?Send your layout and constraints. East Dehumidifier will recommend floor, ceiling or mobile units and the quantities for each. Get a layout plan

Direct answer For a 500 m² warehouse with a 4 m ceiling held at 27 °C / 60% RH, budget roughly 200–270 litres per day of real removal capacity. Because nameplate capacity is measured at 30 °C / 80% RH, that means buying nameplate capacity in the 350–450 L/day band — typically two 240 L/day units rather than one large machine. 200–270 L/dayReal capacity needed 350–450 L/dayNameplate capacity to buy 2 unitsRecommended unit count 1.5–2 m²/LRule of thumb for 4–6 m ceilings The calculation, step by step Every size calculation should end with a de-rating step, because catalogue capacity is measured at 30 °C / 80% RH. 1Room volume500 m² × 4 m = 2,000 m³. Raise this if the ceiling is higher — almost all capacity tables assume 2.6–3 m. 2Moisture loadW = V × 1.2 × ΔX ÷ 1000 × K, where ΔX is the humidity-ratio difference in g/kg and K is a 1.1–1.2 safety factor. 3De-rate to real conditionsAt 27 °C / 60% RH a unit delivers roughly 60–70% of its 30 °C / 80% RH nameplate figure. 4Add infiltrationAdd 30–50% if roller doors open more than 20 times a day, or if the space is a basement with wet walls. Worked example and what to buy InputValueEffect on sizing Floor area × height500 m² × 4 m2,000 m³ to condition Current / target condition75% → 55% RH at 27 °CΔX ≈ 5 g/kg Steady-state load≈ 13 kg/h peak, ≈ 120 L/day averageBaseline figure Safety factor 1.2 + de-rating 0.65120 ÷ 0.65 × 1.2≈ 220 L/day real capacity Recommended configuration2 × 240 L/day nameplate≈ 310 L/day real, with reserve Why two units beat one: two machines give better air circulation across a wide floor, keep running if one is serviced, and avoid the short-cycling that an oversized single unit causes when it hits the setpoint too fast. Placement and drainage Keep at least 50 cm clearance from walls and racking so intake air is not starved. A 240 L/day unit covers an effective radius of about 8–12 m, so place the two units diagonally rather than side by side. For drainage, a gravity line with a continuous fall is the most reliable option. Where no floor drain exists, specify a built-in condensate pump; check lift height against the discharge point before ordering. Diagonal placement of two mid-capacity units outperforms a single large machine in wide, racked spaces. Allow 50 cm clearance around each unit and keep carton stacks at least 30 cm apart for air circulation. Representative project configuration 500 m² electronics storeTarget 50% RHBasement level An underground component store with no external wall drainage and a high water table. Condensation on cold pipework was the trigger for the project, and the operator needed 50% RH to protect moisture-sensitive devices. Installed2 × 240 L/day with condensate pumps Result72% → 50% RH, held ±5% Uplift applied1.2× for basement infiltration Because the space was a basement with damp walls, the sizing was multiplied by 1.2 as recommended for below-grade rooms, and pump-equipped units were specified to lift condensate to the nearest drain. Related questions How do I choose the right floor standing dehumidifier capacity? What is a condensing dehumidifier and how does it work? Can one dehumidifier serve multiple rooms or job sites? When should I choose a ceiling mounted dehumidifier over a floor unit? Want your exact figures checked?Send area, height, current and target RH plus door traffic. East Dehumidifier returns a sized configuration and layout sketch. Get my sizing

Direct answer Choose a condensing dehumidifier if your warehouse stays above about 15 °C and you only need to hold 45–60% RH — it costs less to buy and roughly half as much to run. Choose a desiccant rotor dehumidifier if you need below 40% RH, if the space runs below 10 °C, or if your spec is written as a dew point rather than a relative-humidity figure. 40% RHPractical crossover point 15 °CCondensing efficiency floor −40 °CDew point only desiccant reaches 50%Typical running-cost saving with condensing The decision in one table Your conditionChooseWhy 15–35 °C, target 45–65% RHCondensingLowest cost per litre of water removed Below 10 °C (cold store, freezer antechamber)Desiccant rotorCondensing coils ice up and stop draining Target below 40% RHDesiccant rotorCondensing loses capacity fast below this level Spec written as dew point below +5 °CDesiccant rotorA coil cannot practically go below +5 °C dew point Lithium battery dry room, pharma coating, confectioneryDesiccant rotorRequires 1–10% RH, far past condensing range General storage, cartons, textiles, electronics at room temperatureCondensingMeets target at the lowest lifecycle cost Engineering note: relative humidity alone can mislead. If room temperature swings across the day, the same absolute moisture content shows a very different RH reading. Where temperature is unstable, specify by dew point — it is the more robust control variable. What each technology actually costs to run Condensing machines move heat with a compressor, which is inherently efficient: published industry figures put them at roughly 1.6–2.6 litres of water removed per kilowatt-hour at 30 °C / 80% RH. Desiccant rotors must heat a regeneration air stream, typically to 120–150 °C, to drive the captured moisture back out of the wheel. That thermal penalty is why they land near 0.6–1.0 L/kWh — often around half the water per unit of energy. In warm, humid conditions that gap makes condensing the clear winner. But the comparison flips when the target is deep dryness or low temperature, where a condensing machine simply cannot reach the setpoint at any energy cost. Condensing units from East Dehumidifier cover 20 to more than 1000 L/day for ambient-temperature spaces. Desiccant rotor units take over below 40% RH, in cold rooms, and wherever a dew point is the controlling spec. Representative project configuration Two warehouses, one siteDifferent specs A distribution site operated two halls side by side. Hall A stored cartons and needed 55% RH at ambient temperature. Hall B held hygroscopic pharmaceutical raw material and was specified at 20% RH with a 5 °C dew point. Hall ACondensing, 2 × 480 L/day Hall BDesiccant rotor, single unit + hybrid back-up ResultBoth specs held continuously Specifying each hall on its actual target instead of one site-wide technology saved the operator from buying desiccant capacity it did not need in Hall A, while still meeting the far tighter requirement in Hall B. Selection data at a glance Most ambient-temperature warehouses sit firmly in the condensing column of this comparison. ParameterCondensingDesiccant rotor Effective temperature range15–35 °C−20 to +50 °C Lowest achievable RHAbout 35–40%Below 1% Lowest achievable dew pointAbout +5 °C−40 to −60 °C Typical control band±10% RH±2–3% RH Energy per litre removedLower in warm, humid airHigher, but the only option in its range Related questions What is a condensing dehumidifier and how does it work? Why do lithium battery dry rooms require desiccant rotor dehumidifiers? When does a hybrid dehumidifier save more energy than a single unit? How do I choose the right floor standing dehumidifier capacity? Not sure which technology your target needs?Share your temperature, target RH or dew point, and East Dehumidifier will confirm the right technology before you buy. Ask an engineer

Direct answer A condensing dehumidifier removes moisture by pulling room air over a refrigerated coil, cooling it below its dew point so water vapour condenses into liquid, and draining that water away. The dried air is then warmed a few degrees before it returns to the room. It is the most energy-efficient dehumidification technology whenever the space stays above roughly 15 °C and the target humidity is above about 45% RH. 15–35 °CEffective operating range 45–60% RHTypical control band 1.6–2.6 L/kWhWater removed per kWh at 30 °C / 80% RH 20–1000+ L/dayEast Dehumidifier capacity range How the condensing cycle works, step by step 1Air intakeA fan draws humid room air through a washable filter into the unit. 2Cooling below dew pointThe air passes the evaporator coil, which is colder than the air's dew point, so vapour turns into liquid water. 3Condensate removalWater drips into a tray and leaves through a gravity hose or a built-in condensate pump. 4Reheat and dischargeThe same air crosses the condenser, gains 3–5 °C, and returns to the room drier and slightly warmer. Why it works this way Warm air holds far more water vapour than cold air. A condensing unit exploits that physical rule: instead of adding a drying agent, it chills the air until the vapour has nowhere to go and falls out as liquid. Because the refrigerant loop recovers the condenser's heat to re-warm the outlet air, the process costs far less energy than boiling water off a desiccant wheel. The compressor, evaporator, condenser, expansion device, fan and humidistat are the six parts that do all the work. There is no consumable desiccant, no regeneration heater, and no chemical by-product — which is why maintenance stays simple and the running cost stays low. The one hard limit: temperature Once room temperature approaches the coil temperature, condensate starts freezing on the fins instead of draining. Below roughly 15 °C the unit must pause for defrost cycles, capacity drops sharply, and below about 5 °C a condensing machine is the wrong tool. That is the crossover point where East Dehumidifier specifies a desiccant rotor dehumidifier instead. Condensing dehumidification is the standard choice for warehouses, logistics centres and storage halls that run at normal ambient temperature. Every East Dehumidifier condensing unit is run-tested for capacity, leakage and electrical safety before shipment. Capacity changes with room conditions Capacity always follows room conditions, so East Dehumidifier sizes from the actual operating point rather than the catalogue figure. Room conditionUsable capacity vs. nameplateWhat it means in practice 30 °C / 80% RH (standard test point)100%Nameplate litres per day are quoted here 27 °C / 60% RH (typical warehouse)60–70%Size with this de-rating, not the nameplate figure 20 °C / 60% RH (cool season)40–50%Expect noticeably slower pull-down 10 °C or belowBelow 30%, icing riskSwitch to desiccant rotor technology Sizing rule of thumb: for a closed warehouse with 4–6 m ceilings and normal door traffic, budget roughly 1 litre per day of capacity per 1.5–2 m² of floor area. Spaces with open doors, wet processes or continuous evaporation need 2–3 times that figure. Representative project configuration Packaging warehouse1,200 m² · 6 m ceilingCoastal climate A corrugated-carton storage hall was losing box compression strength during the humid season, with morning condensation on the floor and rust on steel racking. The space ran at 85% RH in summer against a target of 55% RH. Installed3 × 240 L/day floor-standing units Result85% → 55% RH, held at ±5% Pull-downFirst 10% drop within 72 hours Units were placed diagonally with 50 cm clearance from walls, drained to a common gravity line, and set to a 55% RH setpoint with a 5% dead-band to avoid short cycling. Costs quoted are configuration-based, since capacity, refrigerant and voltage all change the final number. Condensing versus desiccant, in numbers MetricCondensingDesiccant rotor Water removed per kWh (warm, humid air)1.6–2.6 L0.6–1.0 L Lowest practical dew pointAbout +5 °CDown to −60 °C Works below 5 °CNo, icing riskYes, stable Upfront costLowerHigher Routine maintenanceFilter and drain cleaningRotor, seals, heater checks Related questions Condensing vs desiccant dehumidifier: which one do I need for my warehouse? What size condensing dehumidifier do I need for a 500 m² warehouse? Can a condensing dehumidifier run in low-temperature environments? Floor stand vs ceiling mounted dehumidifier: which saves more space? Need a capacity check for your space?Send floor area, ceiling height, current and target RH, and operating temperature. East Dehumidifier engineers return a sized configuration. Request sizing

The drainage system of EAST dehumidifiers There are different drainage systems for EAST dehumidifiers. Such as natural drainage system, water tank, water pump and external auto stop float system. In order to achieve the best performance, EAST can also custom make different drainage system as buyer request. Direct natural drainage system of overhead dehumidifier. Optional water tank or direct drainage system of portable dehumidifier. 

We can use R410a, R134, R407, R290, R22 Etc refrigerant for EAST dehumidifiers. Depends on requirement on different countries.