Humidity

Go bigger than necessary. It may cost you a bit more today, but the dehum won't die of overuse within 2-3 years, lol. how are you choosing this 40-50% target? RH should jive with temperature. You likely will have different targets for seedlings vs vege vs flower. Find a VPD table. they almost certainly come with color-coded recommendations for each stage of life cycle. This is how you should choose your target RH... and if tightly controlling temp and RH, how you choose both targets. you can somewhat mitigate excess heat by increasing rh, for example. If temps are running abnormally low, that would be the time you want 40-50% as your target for a proper resulting VPD. Don't be cheap if you need a dehum. If it has to run continuously, it will not hold up long-term. I only grow in winter for this specific reason. I would not 2 commercial strength dehums to keep uop with 6-8 plants and my ambient spring/summer humidity levels. I could probably grow 4x4 with a 200-250 dollar frigidair dehum but it would struggle to keep up in the wettest season. i think you'd be fine with a large consumer dehum... a "real" 50pt/day AHAM dehum. (AHAM = 60% / 60F , if i recall... this is something they can bloat by giving you how many pints it can remove at saturation.. the same unit will say 130-150pts/day at saturation, but this is not useful info unless it is always 90f / 95-100 RH etc..) This is probably more than you need, but it won't have to work hard which means it'll last a long time if you maintain it properly. You'll hear it running less often, too. In floriday, you'll most likely run into higher resulting RH than 60-70. So, adjust what you think your target RH should be based on yoru typical temperatures and a VPD table. After that adjustemnet to perception, buy at last one size bigger than necessary. understand the difference between AHAM ratings and saturation ratings. If they don't show aham, figure it is 1/2 to 1/3rd of saturation pints per day rating. running a dehum is a lot of electricity. consider only growing in dryer seasons and increase scale to make up for it. You'll save money and reduce yearly wear-n-tear on equipment. A grow light runnin ghalf the year instead of year round lasts 2x as long... talking 15-20 years for a good one. Economies of scale save money in addition to minimizing dehum use ...

I mean. You are asking a half question, are you holding your temperatures perfectly constant 24/7, 365, in every room/tent? Conversely, one could look at temperature gating as a method to ensure one stays within a RH boundary... Compressors are bad on trichomes anywhere near them. If you don't care about those nuances, then assuming a standard room height would yield right under 2k cubic feet of air...then you'd be looking to pull roughly 10-15 liters of water from the air daily....which is around 20-30 lbs of water... Assuming you are not rapidly exchanging air in this room you mentioned, then that would be where I start at. Again, the intelligent thing here is to target temperatures rather than RH. Otherwise you are trying to target an emergent property while ignoring the very system that leads to said emergence of said property.

Correct negative pressure setup with variable speeds on the intake and exhaust should allow for around a 20%rh reduction without the need for dehumidifier. So long as your not adding too much concave pressure to the tent. Setting up a passive negative pressure can increase yields as much as 20% which puts it up there with co2.

Midea Cube seems to be well rated. Could always try second hand for a cheaper option. If you got an AC unit in the room already it might have a dehumidify option.

goodday growmie, there are some cheap humdifiers but the cheapest ones is just a bag of rise or rocksalt: Rock salt is essentially a natural hygroscopic mineral, which is excellent at absorbing moisture in the air. Not only does this mineral absorb moisture, but it also stores it like dehumidifiers. In addition to being quite helpful as a dehumidifier, baking soda is inexpensive. This solution is straightforward to use, and it is effective at soaking up moisture in smaller rooms and enclosed spaces.👍 Rice can be used to absorb moisture and assist in reducing humidity in a room. By creating small breathable bags for the dried rice, you will be able to enjoy the dehumidifying advantages of rice..👌 goodlcuk i hope this helps!

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