Fresh air intake with ac

I'm currently pulling fresh air from an adjacent room to my grow. Also got an inline fan pulling hot air outside. Now, since the start of summer my house is getting rather hot, so my air intake cannot cool enough the grow room before behind exhausted. Temps go up to 90f. If I put a window ac in the room that act as intake source, will I still need to open the windows or will my ac supply co2 for my plants? Note that I cannot put the ac in the grow room, the exhaust is taking too much space on the window.

You can leave windows closed.

Does the ac suck air from the outside? I think it's just using the same old air again and again.

The_Cat said:

Does the ac suck air from the outside? I think it's just using the same old air again and again.

Click to expand...

It is recycling your air indeed.

With occupants and shared environment I don't see any need for worry unless your grow is more than 4kW ish. Usually ambient co2 in a home is higher than outdoors.

if your house has central heat or any form of vents ts fine

My house doesn't have any vents beside the exhaust and windows I can open. I guess I'm just gonna leave a window with a crack open so at least air is moving a bit. What are the signs of a plant that doesn't receive enough co2? Stunted growth?

You don't "need" to open a window. In a technically sealed room (drafty house,) I had no ventilation and 3k watts. No co2 supplementation, and I always monitored the co2 levels. It was always fairly high, I think about 500 or 600ppm not sure its been a while.

- Jiji