Mini split air conditioner in non sealed room

hey guys I've been trying to get my grow room finished up. I will be having 2 4x8 tables each with 2 1000w air cooled hoods. So 4000w total. The room is pretty much sealed but I don't want to use co2. My question is if I don't want to use co2 then would I for sure have to have an intake vent or will the air conditioner be enough? I have a carbon filter hooked up right now exhausting air through the roof so I do have negative pressure.

Marco Diaz said:

hey guys I've been trying to get my grow room finished up. I will be having 2 4x8 tables each with 2 1000w air cooled hoods. So 4000w total. The room is pretty much sealed but I don't want to use co2. My question is if I don't want to use co2 then would I for sure have to have an intake vent or will the air conditioner be enough? I have a carbon filter hooked up right now exhausting air through the roof so I do have negative pressure.

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You don't want 20% more? I don't understand. Plants thrive in 1500 ppm of co2 the exchanged air only has 375 @ max

This forum sucks ass. Nobody says anything or knows anything or has a good response.

Marco Diaz said:

This forum sucks ass. Nobody says anything or knows anything or has a good response.

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So you want to cool air just to turn right around and exhaust it ?
this forum does suck.

Yea I didn't make too much sense to me. So should I just get rid of the blower exhausting air out and use it with a filter just scrubbing and recirculating the air within the room? Will the AC be enough to recirculate air in an out of the room?

Yes.

Marco Diaz said:

hey guys I've been trying to get my grow room finished up. I will be having 2 4x8 tables each with 2 1000w air cooled hoods. So 4000w total. The room is pretty much sealed but I don't want to use co2. My question is if I don't want to use co2 then would I for sure have to have an intake vent or will the air conditioner be enough? I have a carbon filter hooked up right now exhausting air through the roof so I do have negative pressure.

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Yes you have to have a fresh air intake in the situation your talking about.

Marco Diaz said:

Yea I didn't make too much sense to me. So should I just get rid of the blower exhausting air out and use it with a filter just scrubbing and recirculating the air within the room? Will the AC be enough to recirculate air in an out of the room?

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A mini-split moves heat in or out of a room not air. Like a mongo frog said, you need fresh air being drawn in with a fan.

I have my room setup to run either way. When I am out of CO2, I have my fans set up on a temp/ humidity/CO2 controller. When I run sealed I can use the mini split.

As the others said, that exhaust is doing nothing for you right now. Your mini split is not bringing air into your room. It's simply cooling the air already in your room, which is why people prefer mini splits when it comes to sealed rooms. You should either just bite the bullet and use co2, or create a passive intake somewhere in the room to alleviate the negative pressure and bring in fresh air. However, doing this will result in you blowing your cold air out of your room, which is a waste of money. You could always set up a co2 system and keep it at a medium-low setting, like 500 or 600 ppm.

Chillin chillin said:

Plants thrive in 1500 ppm of co2 the exchanged air only has 375 @ max

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This would be correct if your drawing air from outside, which most people don't.

Homes where people live usually have 800+ from my experience. Of course theres a bunch of variables but still.

Also went into detail testing stuff a while back but, basically plants don't consume CO2 that fast at all. So theres no need to do massive exchanges. which seems to be the common mantra.

Marco Diaz said:

hey guys I've been trying to get my grow room finished up. I will be having 2 4x8 tables each with 2 1000w air cooled hoods. So 4000w total. The room is pretty much sealed but I don't want to use co2. My question is if I don't want to use co2 then would I for sure have to have an intake vent or will the air conditioner be enough? I have a carbon filter hooked up right now exhausting air through the roof so I do have negative pressure.

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No, you don't need an intake fan. I have a similar setup, mini split, exhaust fan, no CO2. Check the thread in my sig for those who think it doesn't work.

- Jiji

Thanks man!! Will check it out

jijiandfarmgang said:

This would be correct if your drawing air from outside, which most people don't.

Homes where people live usually have 800+ from my experience. Of course theres a bunch of variables but still.

Also went into detail testing stuff a while back but, basically plants don't consume CO2 that fast at all. So theres no need to do massive exchanges. which seems to be the common mantra.



No, you don't need an intake fan. I have a similar setup, mini split, exhaust fan, no CO2. Check the thread in my sig for those who think it doesn't work.

- Jiji

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jijiandfarmgang said:

This would be correct if your drawing air from outside, which most people don't.

Homes where people live usually have 800+ from my experience. Of course theres a bunch of variables but still.

Also went into detail testing stuff a while back but, basically plants don't consume CO2 that fast at all. So theres no need to do massive exchanges. which seems to be the common mantra.



No, you don't need an intake fan. I have a similar setup, mini split, exhaust fan, no CO2. Check the thread in my sig for those who think it doesn't work.

- Jiji

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I'm not sure about your "tests" but I'm in 8 rooms now for 9 years bringing down @ least 5 times a year in each and I can assure you that w ppm levels above the norm(300ish, no clue how a house has 800ish where your @)1300+ you start getting 8-12% more yield, once you hit 1500+ it's more like 14-20% more.

Chillin chillin said:

(300ish, no clue how a house has 800ish where your @)1300+ you start getting 8-12% more yield, once you hit 1500+ it's more like 14-20% more.

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Humans and animals exhale CO2. Plug in a CO2 meter in any home or living/working space, its not going to be the same as outside.

- Jiji

My room is never under 600 ppm's, even when my tank runs out.