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probably he ment heating the space when lights off , or that space is not at all that well insulated or there's some air movement reviews you read are probably from people that use that dehumidifier in their bedroom ...or small grow rooms , or vented ones. you will need a construction type...

I have a very flimsy and thin 3x3 mamoth lite for veg , but it does the job and an very well made home lab 4x8 for flowering , there are a few pin hole light leaks , those are not going to do anything , a lot more light leaks thru the pasive vents but even that will not wake up the girls

900 cfm ... cubic feet pe minute... nvm even with minimal insulation and no air exchange 3x750W hids will need some cooling unless you have very high ceilings about humidity ...any water surface exposed to room air will evaporate and rase rh, also the plants will create a lot of humidity, if...

Hi there , first post here ... I'm on my second grow so more on the noob side with the plants but i'm fairly good at other technical stuff. One thing I see about your plan ... thing is , when temps go below 0 Celsius RH drops to 0 so all the humidity will be generated inside . Another thing ...