Installing mini-split, need advice on vented/sealed and co2

T

Tkboy

Active Member
Iriemedicine said:
I don’t know that it would be harmful to the plants unless it was insane amounts being released, and at that level it may or may not even be safe for you to be working in the room lol I’m not sure. The reason I stop at dark cycle is because CO2 will still remain in the air because it is 100% sealed with no exhaust. The plants will use less CO2 at night because light is required for photosynthesis and the remaining co2 in the room will gradually dissipate through out the course of the night cycle before the room is filled up again with co2 one hour before lights come back on. During the night cycle , the dehumidifier is doing its thing removing the rising humidity from the air and mini split turns on and off when needed to adjust temp.
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Ok so do you set your a/c to maintain the same temps during both lights on and lights off cycles..? I do have a dehumidifier..
 
ANC

ANC

Well-Known Member
But it is not the 7 bucks, it is the hassle of having to go refill it more often.

But I do think CO2 done right and especially from the start,is worthwhile from an investment point of view.

Night time temps can be used to increase or decrease stretch... So, it is just a tool.
 
Iriemedicine

Iriemedicine

Well-Known Member
Tkboy said:
Ok so do you set your a/c to maintain the same temps during both lights on and lights off cycles..? I do have a dehumidifier..
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I’m working on getting it all dialed in since I don’t have an environment controller. No plants inside the room yet. Initially I’ll probably have to go in and adjust my AC right after lights come on and right before lights go off. Dehumidifier will stay on the same setting and kick on and off as needed. How big is your dehumidifier? I went with a quest 105 if you would like to check it out. They are expensive but you deffinately want to go bigger rather than smaller with AC and dehumidifier.
 
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BigHornBuds

BigHornBuds

Well-Known Member
Iriemedicine said:
My thought is that with venting, you would be wasting a lot of supplemental C02 and cooling with intake/exhaust. After you get the minisplit, you are half way there to having a fully sealed climate controled room/environment , why stop there? A good dehumidifier is pretty much all you will have left after mini split and co2 injection. I just bought two twenty lb co2 tanks to swap with each other for the sealed room I’m building and i plan on filling the room up with CO2 an hour before my lights come on, and on a timer releasing CO2 the first 15 min of every hour while lights are on. This is without any intake exhaust setup in a 8x12 room and even so my tanks will likely last 6-12 days each releasing 1000-1500ppm I’m told, maybe a tad longer . I might even opt to get a third twenty lb tank just to have on hand. The 50lbs where just too heavy for me to lug around. Sorry to keep editing I’m waiting on my first cup of coffee lol. Still waking up.
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Do not charge your room one hour before lights on. There’s cells in the leafs called stomas , you want to let them open & “wake up” at normal atmosphere ppm . After about 45-60min charge the space.
I run 1300ppm and let the room bring it down to 1100ppm n then bump back to 1300, 2 hours before lights out the C02 is cut and the room brings it back to normal ppm.
 
BigHornBuds

BigHornBuds

Well-Known Member
Iriemedicine said:
Ahh yes man I got you 100%. It is an expensive endeavor for sure. I plan on having zero vents for my room. I have a 24k BTU mini split, a quest 105 dehumidifier I just got in yesterday and I’m having installed today (Thing is a beast! It runs on 4.9 amps and is capable of removing 105 pints per day), and CO2 injection with a tank and a basic regulator. I don’t have any fancy environmental controllers yet, I estimate co2 output just by doing math and have a thermostat with temp and humidity I monitor and adjust my equipment accordingly. In my 8x12 room I’m running two 1000 watt lights bare bulb and they get hot AF with out any cooling, the mini split however, allows them to run without being air cooled and I still can have full control of the grow room climate regardless of the outside temps.
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You picked a really nice Dehumitifer
Make sure it’s not blowing on your plants , get it up high.
 
T

Tkboy

Active Member
ANC said:
is expensive enough not to waste plus we don;t want to add to the whole CO2 debacle.
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This is why initially I might not run co2 and just vent.. I would just need to find the happy medium between not wasting too much cooled air and making sure that my plants still have normal levels of co2.. :confused:
 
BigHornBuds

BigHornBuds

Well-Known Member
@OP Id just run your space as you are and start collecting the parts to do a sealed room right . Mini split, Dehumitifer, CO2 , lots of fans .
I don’t think I’ll ever want to go back to a vented room again.
 
Iriemedicine

Iriemedicine

Well-Known Member
BigHornBuds said:
Do not charge your room one hour before lights on. There’s cells in the leafs called stomas , you want to let them open & “wake up” at normal atmosphere ppm . After about 45-60min charge the space.
I run 1300ppm and let the room bring it down to 1100ppm n then bump back to 1300, 2 hours before lights out the C02 is cut and the room brings it back to normal ppm.
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Appreciate the info. I was just told about “charging the room” so to speak a few days ago by a friend who has been doing this a lot longer than me so it seemed like a great idea. Makes sense what you said about the stomas. I am taking a shot at the true living organics/ no till style of growing so I am looking to replicate as close to a perfect outdoor growing environment as possible inside my garage.
 
Iriemedicine

Iriemedicine

Well-Known Member
BigHornBuds said:
You picked a really nice Dehumitifer
Make sure it’s not blowing on your plants , get it up high.
Click to expand...
Thanks bro it’s a really heavy one as well! Haha. We are trying to figure out the best way to mount or hang this sucker. It will be opposite side of the room as the plants. Can I utilize the waste water from it or would it be better to just drain it outside?
 
BigHornBuds

BigHornBuds

Well-Known Member
Iriemedicine said:
Appreciate the info. I was just told about “charging the room” so to speak a few days ago by a friend who has been doing this a lot longer than me so it seemed like a great idea. Makes sense what you said about the stomas. I am taking a shot at the true living organics/ no till style of growing so I am looking to replicate as close to a perfect outdoor growing environment as possible inside my garage.
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Starting out, most people try to do too much, and this is why they fail.
KISS keep it simple stoner, as you advance you can add to what your doing .
But C02 is the last thing you should add to a grow, you will only get the really good advantages if your grow is dialed in.

@Tkboy
This controller will make your life a lot easier if you want to slowly setup a sealed room with tanks n venting .
https://growershouse.com/sentinel-chhc-4i-digital-intelligent-total-environmental-controller
 
ANC

ANC

Well-Known Member
The reason I said it is good to start with it is that you will spend the money you would have spent on venting fans and ducting, and can put it to better use.
Don't expect to be pulling grams per Watt the first time around, but with all the info available online these days, some newcomers do very well.
 
Iriemedicine

Iriemedicine

Well-Known Member
BigHornBuds said:
Starting out, most people try to do too much, and this is why they fail.
KISS keep it simple stoner, as you advance you can add to what your doing .
Click to expand...
Been using General Organics, Botanicare ect for the past 5-6 years and finally got rid of the bottle a couple grows ago. Got by with teas ,regular ro water and a couple top dresses through out. Looking at switching to beds and incorporating worms into this grow. Spent way too long in tents before I decided to build a room and seal it. This has been a long evolutionary process for me lol. Always learning and making adjustments.
 
BigHornBuds

BigHornBuds

Well-Known Member
Iriemedicine said:
Thanks bro it’s a really heavy one as well! Haha. We are trying to figure out the best way to mount or hang this sucker. It will be opposite side of the room as the plants. Can I utilize the waste water from it or would it be better to just drain it outside?
Click to expand...
Just put it to waste, you can reuse it , but it can cause problems later on, just not worth the saving .

1” square aluminum tubing
(I forget the measurements but can get them for you tonight if you like)
1” eye bolts x 4
1” eye hooks x 4 . And chain


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Use the feet to attach the tubing
The ends are just tape so when I bump my head , it just hurts n doesn’t cut.
 
T

Tkboy

Active Member
BigHornBuds said:
@OP Id just run your space as you are and start collecting the parts to do a sealed room right . Mini split, Dehumitifer, CO2 , lots of fans .
I don’t think I’ll ever want to go back to a vented room again.
Click to expand...
BigHornBuds said:
Starting out, most people try to do too much, and this is why they fail.
KISS keep it simple stoner, as you advance you can add to what your doing .
But C02 is the last thing you should add to a grow, you will only get the really good advantages if your grow is dialed in.

@Tkboy
This controller will make your life a lot easier if you want to slowly setup a sealed room with tanks n venting .
https://growershouse.com/sentinel-chhc-4i-digital-intelligent-total-environmental-controller
Click to expand...
Yeah I like the look of that unit.. all in one
 
T

Tkboy

Active Member
I’m going to have my mini split installed in the next few days but I’ve just got a couple question..? Does the a/c blower emit any co2 at all or must I vent occasionally to ensure sufficient co2? Would it be better just to leave my fan running 24/7 anyway? Although I would think it would cause the a/c to cycle more regularly seeing as how it would be constantly sucking the cooled air out of the room? I’m a bit at odds with this as it would also be sucking cooler outside air in so maybe the a/c would cycle less? I was thinking of setting a cycle timer on my exhaust fan so that it comes on for 15mins every hour or two hours to replenish the co2.. thoughts on this? Once I’ve got my temps in check I’ll start looking at co2 supplementation options..
 
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