My well water is good. We are over a good aquifer.
My problem is always keeping my rh up. I’m running a humidifier rated for 600 sq” in a 84 sq” room.
When I start venting it goes in the crapper. No probs so far but I’ve had issues when it drops to the teens.
Do you grow in a tent? The tent adds some flexibility to a growroom. By controlling the exhaust of the tent, naturally, it will affect the humidity in the tent. If you have to run the exhaust at a higher rate to keep the temps down, then you need to run your lung room at a lower temp.
I don't have humidifiers in my tents. They are in the lung room. I maintain a set temp and humidity in the lung room and fine tune the levels in the tent with the exhaust fan rate. The room is closed off from the rest of the house and receives no heat or a/c from the house systems
directly. A/C duct from the central AC is taped off. The make up air mainly comes thru the bedroom door cracks.
Since I have a single pipe portable A/C, it's less efficient and will draw make up air into the lung room. It just means that the ac and humidifiers with have to work more to maintain the conditions.
If it was a two pipe, both the AC and humidifiers would work less hard. The concept is still the same with either system. Maintain the lungroom conditions and it's easy to have a very stable environment in the tent.
How you introduce your intake to your tent air can affect your tent conditions. Since the filter and exhaust fan are at the top and back of the tent, I bring in the air thru a dryer vent hose that comes in the left large vent at the top of the tent and run the hose to the left front corner and down below mid tent. Bringing in the air in this fashion, keeps overall temps more even in the tent at different levels.
I have about the same amount of intake hose hanging in as out. This does two things. Even though I have a ceiling fan going to keep the lungroom air mixed to avoid ant temperature stratification, generally, the lower the hose. lower the temps would be. I have my main humidifier sitting below the air intake hose. It does draw in a lot of from the humidifier. The inlet hose is 4in with an 8in exhaust fan. This does increase the velocity of the inlet air for a much better mixing of the air and takes up much less space.
The overkill 8in exhaust fan helps this work better, more efficient and more quiet than a 6in.
Maybe something here will ring a bell and help you in your particular set up.