Help me to find a dehumidifier that would be effective enough.

SnapsProvolone said:

Typical for a sealed room, your dehumidifier will need to pull 4-5 gallons a day per 1000 watt hid. That is with big plants, full canopy.

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SnapsProvolone said:

Going by numbers observed in operations that are doing gram per watt with 70% of area used for canopy, averaging 66% maturity. This includes dehumidification provided by AC in high ambient temp environment with target rh% of 50%


If you're doing less than 4-5 gallons per 1kW light with co2, perhaps your running too cool or growing little biomass.

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I would like to be sure that my dehumidifier would be able to keep RH in control and I am trying to understand how to calculate it, because I can see the price of dehumidifiers vary from few hundred bucks to tens of thousands of dollars. I want to make the right decision.

I have been spending quite some time searching for best offers (capacity vs price) in Europe and I've found:

Dehumidifier A, Dehumidifier B and Dehumidifier C

Dehumidifier A looks like a piece of shit, has a capacity of 24L(6.3 gallons) per day and costs 238 euros (320 dollars). Six of them would give me a total of 144L (38 gallons) of capacity and it would cost in total of 1428 euros (1917 dollars).
144L (38 gallons) per day = 1428 euros (1917 dollars).

Dehumidifier B looks like an industrial machinery and has a capacity of 150L (40 gallons) per day, which is very close to a capacity of 6x dehumidifier B's, but surprisingly it would cost 612 euros (822 dollars) more than six of little ones. Why?
155L (40 gallons) per day = 2040 euros (2739 dollars).

Dehumidifier C says:
1) I have a capacity of 50L (13 gallons) per day which is rated at 70% of RH and temperature of 20C (95F).
2) I have a capacity of 170L (45 gallons) per day which is rated at 100% of RH and temperature of 35C (68F).

What should I be looking at, if my target rate of capacity according to a formula of 4-5 gallons per 1000W of HID light is 38 gallons (144L) per day?

What should I be looking at?

Ask the guys at home depot.

If it were me, and it may be in the future. I'd say 1 big one beats 6 little ones on grounds of simplicity. It looses on not having backup if it fails. 5 out of 6 running trumps 0 out of 1!

I suspect you can increase capacity by adding an overflow to a resevoir thus preventing shut off when full.

Don't know if noise is an issue, but the father in law yas avdomestic unit and it's not quiet. Industrialmstly could be a lot louder?

My guess would be that a second hand industrial one would be best value for money. That's where i'll be starting my search anyway. Looking on ebay there are a lot of options, €300/£250 or round abouts seems to buy something that looks serious enough for the job.

Dehumidifier dies fast when non commercial in nature.

I prefer Phoenix or Drizair units with LGR.

I learned long ago to go with one big commercial unit. a million small ones are a million small problems. i like sante fe / sani dry in addition to snaps recomendations